Introduction
The On-Board Diagnostic (OBD) system is a crucial component of modern vehicles, monitoring emission control systems to ensure optimal performance and environmental compliance. For automotive technicians and smog check inspectors, a thorough understanding of OBD pass/fail criteria is essential for accurately assessing vehicle emissions during inspections. This document provides a comprehensive reference to OBD test standards, focusing on readiness monitors, malfunction indicator lamp (MIL) behavior, communication protocols, and permanent diagnostic trouble codes (PDTCs). It serves as an updated guide, replacing previous references and incorporating the latest revisions to OBD inspection procedures. When performing a smog check, technicians need to quickly Call Pass Obd2 or fail based on a series of standardized tests and readings. This article breaks down those standards and offers guidance for dealing with vehicles that present OBD testing challenges.
Revision History
| Number | Section | Description | Revision Date |
|---|---|---|---|
| 1.0 | N/A | Original. | 09/1/2015 |
| 2.0 | F | Added Section F. BAR-97 Vehicles of Interest. | 01/22/2016 |
| 2.1 | C, E | Added Permanent Diagnostic Trouble Code (PDTC) standards. Added Section E. PDTC Vehicles of Interest. | 04/26/2019 |
| 3.0 | E | Converted reference to HTML format. Retitled Table 3 to Table 3a. Retitled Table 3.5 to Table 3b. Updated cause and instruction for Chrysler, Dodge, Freightliner, Jeep, Mercedes, and Ram in Table 6. | 09/8/2020 |
| 3.1 | D | Added 2020, 2021 Ford Escape and Lincoln Corsair, (non hybrid), except type S trim level. | 12/21/2020 |
| 3.2 | D | Added 2021 Ford Bronco Sport; all engines; Gasoline (not hybrid). Added 2020 – 2021 Ford E Series; all engines; Gasoline. Removed 2021 E/F 350 Cutaway & E/F 450 Stripped Chassis. | 05/21/2021 |
| 3.3 | D | Added 2021, 2022 Ford E 350; all engines; Gasoline (not hybrid). Deleted 2020 – 2021 Ford E Series. | 07/14/2021 |
| 3.4 | D | Updated 2020, 2021 Ford Escape and Lincoln Corsair. | 09/8/2021 |
| 4.0 | N/A | Added modified software standards. Updated reference formatting. | 09/10/2021 |
| 4.1 | D | Added 2021, 2022 Ford E450. | 09/21/2021 |
| 4.2 | D | Updated guidance for 2020-2021 Ford Escape/Lincoln Corsair, 2021 Ford Bronco Sport, and 2021-2022 Econoline E-Series. | 02/10/2022 |
| 4.3 | C, D | Updated number of incomplete monitors allowed to pass OBD test for 2007 and newer diesel from “any two” to “Particulate Filter and NMHC.” Added vehicles with exhaust gas sensor and NOx aftertreatment system monitor readiness issue. | 07/05/2023 |
| 4.4 | D, F | Updated 2020-2022 Escape; 2021-2022 Bronco Sport; 2021-2023 E350, E450, F-650, F-750; 2020-2022 Corsair. Added 2020-2022 F-53 Motorhome, F-59 Commercial Stripped Chassis; link to SSM 50974. | 09/11/2023 |
| 4.5 | D | Updated 2019 Chevrolet Express, 2014–2016 Dodge Ram ProMaster. Added GMC Savana recall. | 11/02/2023 |
| 4.6 | D | Updated 2015–2019 Ford Transit. | 11/08/2023 |
| 4.7 | D | Updated 2019 Chevrolet Express and GMC Savana, 2014-2016 Dodge Ram ProMaster, 2015-2019 Ford Transit. | 11/23/2023 |
| 4.8 | D | Updated 2011-2014 Dodge/Ram 3500 6.7L diesel. Added 2010-2015 Dodge/Ram 2500/3500 6.7L diesel. | 12/23/2023 |
| 4.9 | E | Added Chrysler 2011-2015 200, 2010-2014 300, 2017-2019 Pacifica, and 2011-2015 Town and Country; Dodge 2011-2014 Avenger, 2011-2012 Caliber, 2011-2015 Challenger, 2011-2014 Charger, 2011-2015 Grand Caravan, 2010-2011 Dakota, 2013-2015 Dart, 2011-2014 Durango, 2011-2015 Journey, and 2010-2011 Nitro; Jeep 2014-2015 Cherokee, 2010 Commander, 2010-2015 Grand Cherokee, 2010-2012 Liberty, 2011-2015 Patriot/Compass, and 2010-2015 Wrangler; Ram 2010-2014 1500, 2010-2015 2500, 2011-2015 3500, and 2014 Promaster. | 01/24/2024 |
| 5.0 | D | Updated 2017, 2018 Jaguar. Added 2019 Jaguar. Updated 2017-2018 Land Rover. Added 2018, 2019 Velar. Dealer recall issued to address the NOx aftertreatment readiness issue for the 2017-2019 2.0 and 3.0 liter diesels. | 03/14/2024 |
| 6.0 | D | Added 2025 and newer Ford Explorer models. OBD Test bypass for OBDonUDS vehicles. | 09/21/2024 |
| 7.0 | D | Edited 2015–2019 Ford Transit (diesel). Added 2013-2016 Ford F Series Super Duty 6.7L (diesel). Exhaust Gas Sensor readiness bypass. | 10/05/2024 |
OBD2 Pass/Fail Standards for Smog Inspections
When it comes to vehicle smog inspections, the OBD test is a critical part of the process. Determining whether a vehicle will call pass OBD2 hinges on several key factors, including readiness monitors, the malfunction indicator lamp (MIL), communication with diagnostic tools, and the presence of permanent diagnostic trouble codes (PDTCs). Understanding these standards is crucial for efficient and accurate smog checks.
Readiness Monitor Standards
Readiness monitors are self-diagnostic tests performed by a vehicle’s OBD system to confirm the functionality of emission control components and systems. These monitors run under specific driving conditions, which can sometimes be challenging to achieve in normal daily driving. Vehicle owner manuals may contain drive cycle procedures to help complete these monitors, but this information is often primarily available to the vehicle manufacturer (OEM) and within repair industry service literature.
Successful completion of readiness monitors depends on both the correct driving cycle and the proper operation of the related vehicle components. Monitors must be rerun after any repair work that involves disconnecting the battery or replacing emission-related parts.
The number of incomplete readiness monitors allowed for a vehicle to pass the OBD test varies based on model year and fuel type:
| Model Year | Fuel Type | Number of Incomplete Monitors Allowed to Pass OBD Test¹ |
|---|---|---|
| 1996-1999 | Gas² | Any one³ |
| 2000 and newer | Gas² | Evaporative system³ |
| 1998-2006 | Diesel | Zero |
| 2007 and newer | Diesel | Particulate Filter and Non-Methane HydroCarbon (NMHC)⁴ |
¹ Implemented May 4, 2015.
² “Gas” includes gasoline, propane, natural gas (CNG, LNG, LPG).
³ The misfire, fuel, and comprehensive component continuous monitors are ignored during an OBD test on “gas” vehicles.
⁴ Implemented July 5, 2023.
For gasoline vehicles from model year 2000 and newer, only the evaporative system monitor can be incomplete and still pass the OBD test. For newer diesel vehicles (2007 and newer), the particulate filter and NMHC monitors are the exceptions. All other monitors must be in a ‘ready’ state for the vehicle to call pass OBD2 in terms of readiness.
Malfunction Indicator Lamp (MIL) Standards
The Malfunction Indicator Lamp (MIL), often referred to as the “Check Engine” light, provides a visual indication of potential emission control issues. The MIL’s behavior during key-on engine-off (KOEO) and key-on engine-running (KOER) states is a key factor in determining if a vehicle will call pass OBD2.
| Vehicle | Pass/Fail | Standard |
|---|---|---|
| All with OBDII | Pass | MIL illuminates when key on engine off (KOEO). |
| All with OBDII | Pass | MIL turns off when engine running (KOER). |
| All with OBDII | Fail | MIL does not illuminate when key on engine off (KOEO). |
| All with OBDII | Fail | MIL illuminates when engine running (KOER). |
A properly functioning MIL should illuminate briefly when the ignition is turned on before the engine starts (KOEO) and then turn off once the engine is running (KOER). If the MIL fails to illuminate during KOEO or stays illuminated during KOER, the vehicle will fail the OBD test.
Communication Standards
Successful communication between the inspection equipment and the vehicle’s OBD system is fundamental to performing an OBD test and to accurately call pass OBD2. Communication failures can arise from various sources, including:
- Damaged OBD connector or wiring
- Aftermarket stereo installations interfering with the system
- Transmission computer responding instead of the engine computer
- Invalid data transmission from the vehicle
Here are the communication standards for OBD tests:
| Vehicle | BAR-97/OIS | Standard |
|---|---|---|
| All with OBDII | BAR-97 | Vehicle communicates with BAR-97. |
| All with OBDII | OIS | Vehicle communicates with OIS and transmits required data.¹ |
¹ Required data typically means data from OBD addresses: Mode $01 PID $00, Mode $01 PID $01. Mode $01 PID $00 returns what data is supported on the vehicle. Mode $01 PID $01 returns MIL status, diagnostic trouble codes (DTCs), and monitor status.
For a vehicle to call pass OBD2 based on communication, it must successfully interface with the diagnostic tool (BAR-97 or OIS) and transmit the necessary data, which includes basic OBD information like supported PIDs, MIL status, DTCs, and monitor status.
Permanent Diagnostic Trouble Code (PDTC) Standards
Permanent Diagnostic Trouble Codes (PDTCs) are a type of DTC that, unlike regular DTCs, cannot be cleared using a scan tool or by disconnecting the vehicle’s battery. PDTCs are designed to ensure that vehicle faults are properly addressed and verified as resolved before being cleared. They are cleared automatically by the OBD II system only after it confirms that the underlying issue is no longer present.
Since July 1, 2019, PDTC checks have been incorporated into smog inspections. The standards are as follows:
| Model Year | BAR-97/OIS | Standard |
|---|---|---|
| 1996-1999 | BAR-97 | Not applicable. |
| 2000-2009 | OIS | Not applicable. |
| 2010 and newer ¹ | OIS | Vehicles fail when a PDTC is present. ²,³,⁴,⁵ |
¹ Some 2010 vehicles do not support PDTC. Those without support for PDTC will not be subject to the PDTC check.
² A vehicle with a PDTC stored will fail the PDTC check regardless of whether the MIL is commanded ON or OFF.
³ PDTC presence will be ignored if the vehicle has completed at least 15 warm-up cycles and been driven at least 200 miles since its OBD information was last cleared (as determined by Mode $01 PID $30 and $31).
⁴ BAR is aware of some vehicles that have trouble properly clearing certain PDTCs. BAR is working with the California Air Resources Board (CARB) to ensure that known problematic vehicles are addressed by vehicle manufacturers. Until then, these codes will be ignored by BAR-OIS. For more information, see Permanent Diagnostic Trouble Code Vehicles of Interest.
⁵ Vehicle manufacturers have issued extended warranties, recalls and repair campaigns for some vehicles that have trouble properly clearing PDTCs. These vehicles are listed under Permanent Diagnostic Trouble Code Vehicles of Interest. When one of these vehicles fails for the PDTC, please refer the motorist to the dealer for covered repairs.
For vehicles model year 2010 and newer, the presence of any PDTC will result in a failed OBD test. Even if the MIL is not illuminated, a PDTC will cause the vehicle to call fail OBD2. There are exceptions for vehicles that have completed a certain number of warm-up cycles and mileage since the last OBD data clear, and for specific vehicles known to have PDTC clearing issues (listed in Section E).
Modified Software Standards
The integrity of a vehicle’s software is critical for proper emission control. Since July 19, 2021, smog inspections include a check for modified software. Software that has been approved by the California Air Resources Board (CARB) through an Executive Order is permissible.
Vehicles found with illegally modified software will fail the smog check. The inspection report will indicate “Modified Software” as the reason for failure. To pass a subsequent inspection, the vehicle must be restored to an OEM-approved or CARB-approved software configuration. Re-testing can be done at any licensed smog check station unless directed to a Referee or STAR station. Consumers who wish to dispute inspection results can contact the Smog Check Referee.
OIS Vehicles of Interest
Certain gasoline, flex-fuel, and diesel vehicles, particularly model year 2000 and newer (gasoline/flex-fuel) and 1998 and newer (diesel), are known to exhibit pattern issues during the OBD test portion of an OIS inspection. These issues can range from communication problems and incomplete readiness monitors to OBD test incompatibility and false MIL illumination. In many cases, the OIS system is programmed to accommodate these known anomalies. However, in other instances, vehicle repair may be necessary to call pass OBD2.
| Make | Year | Model Engine (L); Fuel Type | Issue | Cause and Possible Remedy | Instruction to Inspector |
|---|---|---|---|---|---|
| Audi | 2000-2004 | A4 & A6 | Fail for no OBD communication. No response or Only Transmission Control Module responds to DADs requests. ABS and/or brake lamp illuminated in instrument panel cluster. | Broken ground bond wire in ABS module causes diagnostic communication issues with the ABS module, ECM, and TCM. Diagnose and repair per Audi TSB #A45-15-10. | Likely broken vehicle. Repair and retest. |
| BMW | 6/1/99 – 7/31/00 | 323i Sedan | May not pass inspection due to oxygen sensors readiness monitor not set/not fitted/not supported. | DME Software error. Reprogram DME with the updated software. | Check the DME “programmed control unit” number listed in TSB #SI B12 16 16 and follow TSB instructions. |
| BMW | 9/3/99 – 7/31/00 | 323iT Touring | May not pass inspection due to oxygen sensors readiness monitor not set/not fitted/not supported. | DME Software error. Reprogram DME with the updated software. | Check the DME “programmed control unit” number listed in TSB #SI B12 16 16 and follow TSB instructions. |
| BMW | 6/1/99 – 7/29/00 | 323Ci Coupe | May not pass inspection due to oxygen sensors readiness monitor not set/not fitted/not supported. | DME Software error. Reprogram DME with the updated software. | Check the DME “programmed control unit” number listed in TSB #SI B12 16 16 and follow TSB instructions. |
| BMW | 6/23/99 – 7/29/00 | 323 Cic Convertible | May not pass inspection due to oxygen sensors readiness monitor not set/not fitted/not supported. | DME Software error. Reprogram DME with the updated software. | Check the DME “programmed control unit” number listed in TSB #SI B12 16 16 and follow TSB instructions. |
| BMW | 2000 | M52 (TU) engine | May not pass inspection due to oxygen sensors readiness monitor not set/not fitted/not supported. | DME Software error. Reprogram DME with the updated software. | Check the DME “programmed control unit” number listed in TSB #SI B12 16 16 and follow TSB instructions. |
| BMW | 2000 | Fail for readiness. Vehicle may not set oxygen sensor readiness monitor. | Software error in ECM. Reflash ECM per Recall #00E-A01. See BMW bulletin #SI B 12 15 99, dated November 2000. | Vehicle requires reflash. Reflash ECM per recall so oxygen sensor monitor will set. | |
| BMW | built 3/98 – 7/99 | 323i, 323iA, 328i, 328iA | Fail for readiness. Vehicle may not set oxygen sensor readiness monitor. | Software error in ECM. Reflash ECM per Recall #00E-A01. See BMW bulletin #SI B 12 15 99, dated November 2000. | Vehicle requires reflash. Reflash ECM per recall so oxygen sensor monitor will set. |
| BMW | built 2/99 – 7/99 | 328iC, 328iCA, 323iC, 323iCA, 528i, 528iA, 528iT, 528iAT | Fail for readiness. Vehicle may not set oxygen sensor readiness monitor. | Software error in ECM. Reflash ECM per Recall #00E-A01. See BMW bulletin #SI B 12 15 99, dated November 2000. | Vehicle requires reflash. Reflash ECM per recall so oxygen sensor monitor will set. |
| BMW | built 9/98 – 7/99 | Z3 roadster 2.3 | Fail for readiness. Vehicle may not set oxygen sensor readiness monitor. | Software error in ECM. Reflash ECM per Recall #00E-A01. See BMW bulletin #SI B 12 15 99, dated November 2000. | Vehicle requires reflash. Reflash ECM per recall so oxygen sensor monitor will set. |
| BMW | built 4/99 – 7/99 | Z3 roadster coupe/ roadster 2.8 | Fail for readiness. Vehicle may not set oxygen sensor readiness monitor. | Software error in ECM. Reflash ECM per Recall #00E-A01. See BMW bulletin #SI B 12 15 99, dated November 2000. | Vehicle requires reflash. Reflash ECM per recall so oxygen sensor monitor will set. |
| BMW | 2001-2003 | Z3 M Roadster/coupe with S54 engine | Fail for no communication when ignition switched off/on. OBD communication always possible with BMW DIS or GT1 tester. | Voluntary Emissions Recall Campaign to reprogram the engine control units (DME) on all affected vehicles. Bulletin #SI B12 11 06 dated October 2007. | Follow OIS prompts. Connect/disconnect DAD when key off. |
| BMW | 2000-2003 | Z8 & M5 with S62 engine | Fail for no communication when ignition switched off/on. OBD communication always possible with BMW DIS or GT1 tester. | Voluntary Emissions Recall Campaign to reprogram the engine control units (DME) on all affected vehicles. Bulletin #SI B12 11 06 dated October 2007. | Follow OIS prompts. Connect/disconnect DAD when key off. |
| BMW | From series intro. up to 8/27/2004 | M3 with S54 engine | Fail for no communication when ignition switched off/on. OBD communication always possible with BMW DIS or GT1 tester. | Voluntary Emissions Recall Campaign to reprogram the engine control units (DME) on all affected vehicles. Bulletin #SI B12 11 06 dated October 2007. | Follow OIS prompts. Connect/disconnect DAD when key off. |
| BMW | 2003 | M3 | Failure to set EGR monitor. | Check thermostat | Likely broken vehicle. Repair and retest. |
| BMW | 2007 | 328i | Engine dies during OBD Test, won’t restart. | Separate the vehicle and key. Wait 20+ minutes. Attempt to restart. | Test normally. BAR-OIS will not request Cal ID or CVN. Possible keyless ignition related issue. The vehicle will recover by just letting it sit for 20+ minutes with the wireless key fob out of range of the vehicle. |
| Chevrolet | 1998-2005 | DIESEL C/K2500 & C/K3500 (including Silverado and Suburban), G30, G3500 (including Sport Van, Express Cut-Away & Cargo), P30 | Federal diesel vehicle over 8,500 GVWR is not OBD-II certified. | Federal diesel vehicles over 8,500 GVWR were not built to comply with OBD-II or Fed OBD standards. | Test normally. BAR-OIS will ignore incomplete continuous monitors. If the vehicle fails to communicate, use the result of the bulb check for the overall result of the OBD Test if the analyzer offers this option. |
| Chevrolet | 1999-2005 | 3500 W35042 (box truck) [GVWR 10,001 – 14,000] (diesel) [Federal certified] | Vehicle is not equipped with OBD II. | OBD not installed in federals during these years. | OIS programmed to skip the OBD functional test. |
| Chevrolet | 2000-2002 | S-10 (2WD), 2.2L I-4 (E85) | Monitors won’t set on certain flex fuel models, VINs listed below. YGMXT02.2121 YGMXT02.2122 1GMXT02.2122 2GMXT02.2122 YGMXT02.2121 YGMXT02.2122 (VIN 8th digit: 5) | System monitors disabled for operation > E15 blends: O2 Sensor Heater, Secondary Air, Catalyst. System monitors disabled for operation > E10 blends: Evaporative leak check. Desensitized O2 Senor monitor implemented; only reports faults during operation E15 blends. | OIS ignores all 11 readiness monitors. |
| Chevrolet | 2000-2005 | Suburban, Silverado, Express, Avalanche (gasoline) [Federal certified] | Message appears during OIS OBD II test stating, “Unable to confirm this Vehicle’s OBD II requirements. Does this vehicle have OBD II?” | Federally certified vehicle may not be certified to OBD II standards. | Check under-hood emission label to determine OBD certification status. Enter correct result into OIS and follow OIS prompts. OIS may state a BAR-97 test is required on vehicles without OBDII. |
| Chevrolet | 2001 | Silverado / Tahoe C/K 1500 | Failure to set secondary air system monitor. | Possible air injection problem (check valve(s), vacuum line, pump, air passages). | Diagnose. Repair and retest. |
| Chevrolet | 2002 | Silverado C/K 2500HD (diesel) | Failure to set EGR monitor. | Difficult drive cycle. | OIS reprogrammed 10/13/2016 to allow monitor to be incomplete. |
| Chevrolet | 2001-2002 | Cavalier CNG First VIN digit “3” (built in Mexico) | Failure to set CAT monitor. | Vehicle design anomaly. | OIS reprogrammed 02/11/2015 to allow any one monitor to be incomplete. |
| Chevrolet | 2019 | Express 2.8L (diesel) [California certified] | Exhaust Gas Sensor monitor will not complete. A Particulate Matter sensor fault may not set DTC or illuminate MIL. | The Engine Control Module (ECM) may not properly handle diagnostic information for the exhaust Particulate Matter (PM) sensor. Dealers are to reprogram the ECM per Emission Recall N232408230. | Vehicle requires reflash. Perform recall then retest. |
| Chrysler | 1999-2000 | Town & Country with 3.0L engine built after 12/1/1998 | EGR Monitor will not complete at high altitude. | Reflash available. Confirm all systems functioning. Erase and reprogram PCM per TSB 18-03-00. | Vehicle requires reflash. Repair per TSB, run monitors then retest. |
| Chrysler | 2000 | Town and Country 3.3L V-6 (E-85) | Readiness monitors will not set on certain flex fuel models, VINs listed below. WCRXT03.32BP (VIN 8th digit: G) | All monitors disabled for operation >E30 and ethanol fuel content learning. | OIS ignores all 11 readiness monitors. |
| Chrysler | 2003 | PT Cruiser 2.4 liter DOHC 16v turbocharged (sales code EDV) with 5- spd manual G288 trans (sales code DDD) | Failure to set catalyst monitor. | PCM software error. Dealer must reprogram PCM. Emissions warranty extended to lifetime for this issue. Diagnose and repair per TSB #18-112-16. Possible repair payment reimbursement, see warranty D-16-26. | Vehicle requires reflash. Repair per TSB and retest. |
| Chrysler | 2010 built prior to 2/20/2010 | 300, Charger, Challenger 3.5L (5 speed automatic transmission) | Fail for monitor readiness, Or MIL illumination: P0456, P0452, P1115. | Reflash available. See Chrysler TSB #18-008-10 | Vehicle requires reflash. Repair per TSB and retest. |
| Dodge | 1998-2002 | Ram Truck 5.9L (Cummins diesel) [California certified] | Some continuous monitors will not complete. | Vehicle design anomaly. | Test normally. BAR-OIS allows one incomplete continuous monitor. |
| Dodge | 1998-2006 | Ram 2500, Ram 3500 (diesel) [Federal certified] | Federal diesel vehicle over 8,500 GVWR is not OBD-II certified. | Federal diesel vehicles over 8,500 GVWR were not built to comply with OBD-II or Fed OBD standards. | Test normally. BAR-OIS will ignore incomplete continuous monitors. If the vehicle fails to communicate, use the result of the bulb check for the overall result of the OBD Test if the analyzer offers this option. |
| Dodge | 1999-2000 | Caravan with 3.0L engine built after 12/1/1998 | EGR Monitor will not complete at high altitude. | Reflash available. Confirm all systems functioning. Erase and reprogram PCM per TSB 18-03-00. | Vehicle requires reflash. Repair per TSB, run monitors then retest. |
| Dodge | 2003 | Dakota, Durango and Ram Trucks with 4.7L engine [California or 50 state certified] | Catalyst monitor readiness status shows as not supported. | Broken vehicle, repair per TSB #18-032-10 with lifetime warranty. | Test normally. OIS ignores unsupported monitors. |
| Dodge | 2003 | Ram Truck 5.9L (Cummins diesel) [California certified] | MIL light is commanded on, but check engine light is not illuminated and no DTCs are stored. | Vehicle design anomaly Recall campaign #K01 for ECM reflash applies to California certified vehicles only. | Test normally. OIS ignores MIL Command if no DTCs are present on this vehicle Advise motorist of Recall Campaign #K01 if the vehicle is California certified. |
| Dodge | 2003-2004 | 25004X2 and Sprinter 35004X2 (diesel) [2003 Federal certified] [2004 Federal certified] | Federal diesel vehicle over 8,500 GVWR is not OBD-II certified. | Federal diesel vehicles over 8,500 GVWR were not built to comply with OBD-II or Fed OBD standards. | Test normally. BAR-OIS will ignore incomplete continuous monitors. If the vehicle fails to communicate, use the result of the bulb check for the overall result of the OBD Test if the analyzer offers this option. |
| Dodge | 2004-2005 built after 12/7/2003 | Ram Truck 5.9L (Cummins diesel) [California certified] | Comprehensive component monitor will not complete. | Vehicle design anomaly Re-flash available per TSB #18-030-10 with lifetime warranty per TSB #18-003-11. | Test normally. OIS allows one incomplete readiness monitor. Advise motorist of fix with lifetime warranty per TSB #18-003-11. |
| Dodge | 2004-2006 | 2500 3500 Sprinter (diesel) | EGR/VVT monitor will not complete. | ECU software error. | Test normally. OIS will ignore EGR/VVT monitor. |
| Dodge | 2005 | Ram Truck 5.9L (Cummins diesel) [Federal certified] | Misfire and Comprehensive Components monitors will not complete. | Vehicle design anomaly. | Test normally. OIS ignores misfire and comprehensive component monitor readiness. |
| Dodge | 2006-2007 | Ram Truck 5.9L, 6.7L (Cummins diesel) [California certified] | Fuel System and Comprehensive Components monitors will not complete. | Recall campaign #K01 for ECM reflash applies to California certified vehicles only. | Test normally. OIS ignores fuel and comprehensive component monitor readiness. Advise motorist of Recall Campaign #K01 if the vehicle is California certified. |
| Dodge | 2006-2007 | Ram Truck with 5.9L (ETC or ETH) built after 1/1/06, [Federal Certified], Cab Chassis with 6.7L (ETJ) built before 1/11/07 (Cummins diesel) [Federal certified] | Fuel System and Comprehensive Components monitors will not complete. | TSB #18-017-10 for ECM reflash applies to Federal certified vehicles only. | Test normally. OIS ignores fuel and comprehensive component monitor readiness. Advise motorist of TSB #18-017-10 if the vehicle is Federal certified. |
| Dodge | 2010 built before 2/20/10 | 300, Charger, Challenger 3.5L (5 speed automatic transmission) | Evaporative monitor will not set. | Evaporative leak detection monitor may not set to ready. | Test normally. Inform consumer of TSB #18-008-10 Revision A. |
| Dodge/Ram | 2010-2015 | 2500 & 3500 6.7L (diesel) [California certified] | NOx after-treatment monitor will not complete. | Vehicle design anomaly. | Test normally. BAR-OIS temporarily allows NOx after-treatment monitor to be incomplete until vehicle manufacturer remedy is available. |
| Dodge/Ram | 2014 | ProMaster 2500 & 3500 High 3.0L (diesel) [California certified] | Exhaust Gas Sensor monitor will not complete. | Vehicle design anomaly. Dealers are to perform Recall V97 and ZC0. | Vehicle requires reflash. Perform recall then retest. |
| Dodge/Ram | 2015 | ProMaster 1500, 2500, & 3500 High & Standard 3.0L (diesel) [California certified] | Exhaust Gas Sensor monitor will not complete. | Vehicle design anomaly. Dealers are to perform Recall V97 and ZC0. | Vehicle requires reflash. Perform recall then retest. |
| Dodge/Ram | 2016 | ProMaster 2500 & 3500 High 3.0L (diesel) [California certified] | Exhaust Gas Sensor monitor will not complete. | Vehicle design anomaly. Dealers are to perform Recall V97. | Vehicle requires reflash. Perform recall then retest. |
| Ford | 1998-2003 | Truck 7.3L (diesel) | Engine could shut off when requesting Mode $09 data with aftermarket scan tool. | Vehicle design anomaly. | Test normally. OIS programmed to skip Mode $09 data request on these vehicles. |
| Ford | 1998-2004 | F250, F350, E350, E450, E Super Duty, Econo Commercial S- Duty, Econo RV S- Duty (diesel) [Federal certified] | Federal diesel vehicle over 8,500 GVWR is not OBD-II certified. | Federal diesel vehicles over 8,500 GVWR were not built to comply with OBD-II or Fed OBD standards. | Test normally. BAR-OIS will ignore incomplete continuous monitors. If the vehicle fails to communicate, use the result of the bulb check for the overall result of the OBD Test if the analyzer offers this option. |
| Ford | 2000-2004 | F250, F350, E350, Excursion (gasoline) [Federal certified] | Message appears during OBD II test stating, “Unable to confirm this Vehicle’s OBD II requirements. Does this vehicle have OBD II?” | Federally certified vehicle may not be certified to OBD II standards. | Check under-hood emission label to determine OBD certification status. Enter correct type into OIS and follow OIS prompts. OIS may state a BAR-97 test is required on vehicles without OBDII. |
| Ford | 2003 | Focus | Fail for readiness. | Monitors may be difficult to complete. | Broken Vehicle. Reflash PCM per TSB #06-7-5. Then test normally. |
| Ford | 2004 | E350 Super duty 5.4 (gas) | Failure to set CAT monitor. | Vehicle design anomaly Recall #15E06 dated 1/13/2016 may apply. Reflash ECM so CAT monitor will set. | Vehicle requires reflash. Repair per recall and retest. |
| Ford | 2011 | Edge, Explorer 3.5L & 3.7L | Vehicle fails for readiness. Some vehicles do not set readiness monitors. | Some vehicles clear the OBD-II diagnostic data on every engine start and/or incorrectly report the VIN. Reprogram or update vehicle’s calibration. Perform monitor drive cycle. | Please consult Ford Emission Recall #13E04 for applicability. Owner must ensure recall is performed if required and all monitor drive cycles are completed prior to Smog Check testing. |
| Ford | 2013-2016 | F series, Super Duty 6.7L (diesel) | Exhaust Gas Sensor monitor will not complete. | After DOC or DPF replacement on vehicles , EGS monitor will not run until degreening strategy completes (up to 6,000 to 10,000 miles). | Test normally. OIS will ignore incomplete EGS monitor on certain VINs provided by Ford where the DOC or DPF were replaced after January 1, 2022. Other vehicles are currently under investigation. Expires 10/8/2025. |
| Ford | 2015-2019 | Transit 3.2L (diesel) | Exhaust Gas Sensor monitor will not complete. | After DOC or DPF replacement, EGS monitor will not run until degreening strategy completes (up to 6,000 to 10,000 miles). | Test normally. OIS will ignore incomplete EGS monitor on certain VINs provided by Ford where the DOC or DPF were replaced after January 1, 2022. Other vehicles are currently under investigation. Expires 10/8/2025. |
| Ford | 2020-2022 | Escape; all engines; Gasoline and hybrid | Might not communicate with BAR-OIS. | Design issue. Software update available. | Test normally. If the vehicle you are inspecting fails the OBD test for no communication, direct the vehicle to a Ford dealership for a software update. Issue may be due to software in gateway module—see SSM 50974. Similar messaging will be displayed on the OIS during the inspection, and printed on the VIR for consumers. |
| Ford | 2021-2022 | Bronco Sport; all engines; Gasoline (not hybrid) | Might not communicate with BAR-OIS. | Design issue. Software update available. | Test normally. If the vehicle you are inspecting fails the OBD test for no communication, direct the vehicle to a Ford dealership for a software update. Issue may be due to software in gateway module—see SSM 50974. Similar messaging will be displayed on the OIS during the inspection, and printed on the VIR for consumers. |
| Ford | 2021-2023 | E350, E450; all engines; Gasoline (not hybrid) | Might not communicate with BAR-OIS. | Design issue. Software update available. | Test normally. If the vehicle you are inspecting fails the OBD test for no communication, direct the vehicle to a Ford dealership for a software update. Issue may be due to software in gateway module—see SSM 50974. Similar messaging will be displayed on the OIS during the inspection, and printed on the VIR for consumers. |
| Ford | 2025 and newer | Explorer (2.3L) AWD, RWD. Test Group SFMXT02.34K2. | Fail for no OBD communication. | Vehicle has OBDonUDS. DAD 1.0 units will not communicate with OBDonUDS vehicles. | Cal-VIS software programmed to skip the OBD test until DAD 2.0 units are BAR certified. |
| Freightliner | 1998-2004 | M Line Walk In Van [GVWR 6,001-14,000] (diesel) [Federal certified] | Vehicle is not equipped with OBD II. | OBD not required in federally certified vehicles in this GVWR range during these years. | OIS programmed to skip the OBD functional test. |
| Freightliner | 2004-2006 | Sprinter (diesel) | EGR/VVT monitor will not complete. | ECU software error. | Test normally. OIS will ignore EGR/VVT monitor. |
| GM | 2000 – 2008 | Various models, and Silverado 1500 | OIS prompts for no vehicle voltage. | No power on vehicle’s OBDII connector (DLC pin 16). Possible blown fuse. | Use auxiliary DAD cables / power supply per DAD manufacturer’s instructions. |
| GM | 2015-2017 | All gasoline powered | Fail for readiness. | Post catalyst oxygen sensor monitor will not run until after 1,000 mile catalyst break in. See Bulletin #15-NA-010. | Inspect vehicle after 1,000 miles or send to Referee. |
| GMC | 1998-2005 | DIESEL C/K2500 & C/K 3500 (including Suburban and Sierra), Savana G3500, Workhorse P30 Forward Cntl | Federal diesel vehicle over 8,500 GVWR is not OBD-II certified. | Federal diesel vehicles over 8,500 GVWR were not built to comply with OBD-II or Fed OBD standards. | Test normally. BAR-OIS will ignore incomplete continuous monitors. If the vehicle fails to communicate, use the result of the bulb check for the overall result of the OBD Test if the analyzer offers this option. |
| GMC | 1999-2005 | W3500 W35042 (box truck) [GVWR 10,001 – 14,000] (diesel) [Federal certified] | Vehicle is not equipped with OBD II. | OBD not required in federally certified vehicles in this GVWR range during these years. | OIS programmed to skip the OBD functional test. |
| GMC | 2000-2002 | Sonoma (2WD), 2.2L I-4 (E85) | Monitors won’t set on certain flex fuel models, VINs listed below. YGMXT02.2121 YGMXT02.2122 1GMXT02.2122 2GMXT02.2122 YGMXT02.2121 YGMXT02.2122 (VIN 8th digit: 5) | System monitors disabled for operation > E15 blends: O2 Sensor Heater, Secondary Air, Catalyst. System monitors disabled for operation > E10 blends: Evaporative leak check. Desensitized O2 Senor monitor implemented; only reports faults during operation E15 blends. | All 11 readiness monitors ignored in OIS. |
| GMC | 2000-2005 | Sierra, Yukon, Savana (gasoline) [Federal certified] | Message appears during OIS OBD II test stating, “Unable to confirm this Vehicle’s OBD II requirements. Does this vehicle have OBD II?” | Federally certified vehicle may not be certified to OBD II standards. | Check under-hood emission label to determine OBD certification status. Enter correct type into OIS and follow OIS prompts. OIS may state a BAR-97 test is required on vehicles without OBDII. |
| GMC | 2002 | Sierra C/K 2500HD (diesel) | Failure to set EGR monitor. | Difficult drive cycle. | OIS reprogrammed 10/13/2016 to allow monitor to be incomplete. |
| GMC | 2019 | Savana 2.8L (diesel) [California certified] | Exhaust Gas Sensor monitor will not complete. A Particulate Matter sensor fault may not set DTC or illuminate MIL. | The Engine Control Module (ECM) may not properly handle diagnostic information for the exhaust Particulate Matter (PM) sensor. Dealers are to reprogram the ECM per Emission Recall N232408230. | Vehicle requires reflash. Perform recall then retest. |
| GMC | 2022 | Sierra K2500 SLT 6.6L (diesel) [California certified] | Exhaust Gas Sensor monitor will not complete. | Vehicle design anomaly. | Test normally. BAR-OIS temporarily allows Exhaust Gas Sensor monitor to be incomplete until vehicle manufacturer remedy is available. |
| Hyundai | 2002 | Sonata | Fail for readiness. | Monitors are difficult to complete; perform drive cycle two times. | Run drive cycle. See TSB #02-36-030. |
| Hyundai | 2003 | Tiburon | Will not communicate with generic OBD test equipment. | Pin 5 not grounded. Ground pin 5 by jumping to pin 4 in DLC per TSB. | Test normally on OIS. If using generic OBD test equipment, perform recall campaign #057 and Hyundai TSB #03-01-003-01. |
| Infiniti | 2000 -2001 | I30 | Failure to set catalyst monitor. | Only OEM scan tool shows OBD catalyst code. | Test catalyst and replace if defective. |
| Infiniti | 2000 -2001 | I30 | Fail for readiness. | Vehicle has difficulty completing all monitors during normal driving. | Run drive cycle. |
| Isuzu | 1998-2005 | NPR [GVWR 10,001- – 14,000] (diesel) [Federal certified] | Vehicle is not equipped with OBD II. | OBD not required in federally certified vehicles in this GVWR range during these years. | OIS programmed to skip the OBD functional test. |
| Isuzu | 2000-2002 | Hombre (2WD) 2.2L I-4 (E85) | Monitors wont set on certain flex fuel models, VINs listed below. YGMXT02.2121 YGMXT02.2122 1GMXT02.2122 2GMXT02.2122 YGMXT02.2121 YGMXT02.2122 (VIN 8th digit: 5) | System monitors disabled for operation > E15 blends: O2 Sensor Heater, Secondary Air, Catalyst. System monitors disabled for operation > E10 blends: Evaporative leak check. Desensitized O2 Sensor monitor implemented; only reports faults during operation E15 blends. | OIS ignores all 11 readiness monitors. |
| Jaguar | 2017 | Jaguar XE, XF, & F-Pace 2.0L (diesel) [California certified] Test Group HJLXJ02.0STY | NOx Aftertreatment System monitor will not complete. | Vehicle design anomaly. Dealer issued recall H444. | Test normally. If the vehicle you are inspecting fails the OBD test for incomplete NOx aftertreatment monitor, direct the vehicle to a Jaguar dealership for a software update. |
| Jaguar | 2018 | Jaguar XE, XF, F-Pace & Rover Velar 2.0L (diesel) [California certified] Test group JJLXJ02.0STY | NOx Aftertreatment System monitor will not complete. | Vehicle design anomaly. Dealer issued recall H444. | Test normally. If the vehicle you are inspecting fails the OBD test for incomplete NOx aftertreatment monitor, direct the vehicle to a Jaguar dealership for a software update. |
| Jaguar | 2019 | Jaguar XE, XF, & F-Pace 2.0L (diesel) [California certified] Test group KJLXJ02.0STY | NOx Aftertreatment System monitor will not complete. | Vehicle design anomaly. Dealer issued recall H444. | Test normally. If the vehicle you are inspecting fails the OBD test for incomplete NOx aftertreatment monitor, direct the vehicle to a Jaguar dealership for a software update. |
| Jeep | 2005-2006 | Wrangler | O2 sensor, O2 heater, and catalyst readiness monitors may indicate not ready. | Vehicle design anomaly. TSB #25-005-13 Rev. A contains wiring modification to make vehicle ready. | OIS allows incomplete O2 heater monitor. |
| Jeep | 2010-2011 | Wrangler 3.8L | Failure to set Oxygen sensor monitor. PCM not running monitor frequently enough. | Recall L34 (m/t) through 9/10/2010. Recall L35 (a/t) through 3/26/2011, and/or OEM drive cycle not working. | Reflash PCM per TSB 18-027-10. May need to run special drive cycle to set O2 monitor. [Coast from 70 to 30mph three times then pullover and restart engine.] |
| Kia | 2009 | Borrego LX/EX 3.8L | Fail for readiness. Vehicle may not set EGR monitor. | Vehicle has difficulty completing EGR monitor. Difficult to run drive cycle. | OIS reprogrammed 12/7/2017 to allow EGR/VVT monitor to be incomplete. |
| Land Rover | 2017 | Discovery, Range Rover, Range Rover Sport 3.0L (diesel)[California certified] Test group HJLXT03.0GTR | NOx Aftertreatment System monitor will not complete. | Vehicle design anomaly. Dealer issued recall N808. | Test normally. If the vehicle you are inspecting fails the OBD test for incomplete NOx aftertreatment monitor, direct the vehicle to a Land Rover dealership for a software update. |
| Land Rover | 2018 | Velar 2.0L (diesel) [California certified] Test group JJLXJ02.0STY | NOx Aftertreatment System monitor will not complete. | Vehicle design anomaly. Dealer issued recall N808. | Test normally. If the vehicle you are inspecting fails the OBD test for incomplete NOx aftertreatment monitor, direct the vehicle to a Land Rover dealership for a software update. |
| Land Rover | 2019 | Velar 2.0L (diesel) [California certified] Test group KJLXJ02.0STY | NOx Aftertreatment System monitor will not complete. | Vehicle design anomaly. Dealer issued recall N808. | Test normally. If the vehicle you are inspecting fails the OBD test for incomplete NOx aftertreatment monitor, direct the vehicle to a Land Rover dealership for a software update. |
| Lexus | 2007 | RX400 Hybrid | Fail for oxygen sensor (air/fuel) monitor readiness. Air conditioning readiness monitor mistakenly set to supported instead of unsupported. | Air Fuel monitor issue. Perform software update to vehicle at no charge per Lexus campaign FLD with TSB #L-SB-0027-15. | If fails for incomplete oxygen sensor monitor, advise motorist recall may be required. Recall status: use https://www.toyota.com/recall. |
| Lincoln | 2011 | MKX 3.5L & 3.7L | Vehicle fails for readiness. Some vehicles do not set readiness monitors. | Some vehicles clear the OBD-II diagnostic data on every engine start and/or incorrectly report the VIN. Reprogram or update vehicle’s calibration. Perform monitor drive cycle. | Please consult Ford Emission Recall #13E04 for applicability. Owner must ensure recall is performed if required and all monitor drive cycles are completed prior to Smog Check testing. |
| Lincoln | 2020-2022 | Corsair; all engines; Gasoline and hybrid | Might not communicate with BAR-OIS. | Design issue. Software update available. | Test normally. If the vehicle you are inspecting fails the OBD test for no communication, direct the vehicle to a Ford dealership for a software update. Issue may be due to software in gateway module—see SSM 50974. Similar messaging will be displayed on the OIS during the inspection, and printed on the VIR for consumers. |
| Mazda | 2000 | MPV | Failure to set Catalyst monitor. | May need catalyst and/or oxygen sensor. Diagnose and repair. | Likely broken vehicle. Repair and retest. |
| Mazda | 2002-2003 | B3000 (2WD) 3.0L V-6 (E-85) | Readiness monitors will not set on certain flex fuel models. | Monitors disabled for operation >E10 blends: Catalyst. Desensitized evaporative leak/purge check monitor to detect gross leak for operation >E75 blends (monitor fully compliant up to E75 blends). | OIS ignores all 11 readiness monitors. |
| Mazda | 2003-2004 | Mazda 6 | Some vehicles may have a false MIL illumination during inspection with multiple U-code DTCs during OBDII test. The following OBD Codes may be set. (U1900-ABS, U2516-ABS, U1900-FF- IC, U2516-FF-IC, U0073-FF- PCM, U0073-FF-TCM, U0100-FF-TCM). | PCM sensitive to OBD tool connect or disconnect to DLC with ignition in the “On” position, or when the engine is running. See Mazda Service Bulletin #01-002/05 Dated 01/13/2005. Erase trouble codes, disconnect tool when ignition switch off. | Reset monitors. Connect/disconnect DAD to vehicle only when key off. |
| Mazda | 2005 | Mazda 6 (with 2.3 only) | Some vehicles may have a false MIL illumination during inspection with multiple U-code DTCs during OBDII test. The following OBD Codes may be set. (U1900-ABS, U2516-ABS, U1900-FF- IC, U2516-FF-IC, U0073-FF- PCM, U0073-FF-TCM, U0100-FF-TCM). | PCM sensitive to OBD tool connect or disconnect to DLC with ignition in the “On” position, or when the engine is running. See Mazda Service Bulletin #01-002/05 Dated 01/13/2005. Erase trouble codes, disconnect tool when ignition switch off. | Reset monitors. Connect/disconnect DAD to vehicle only when key off. |
| Mazda | 2003-2005 | Mazda 6 – 2.3 engine non PZEV (built May 20, 2002 – July 2, 2005) Mazda 6 – 3.0 engine (built May 16, 2002 – August 23, 2004) | Some vehicles may have a false MIL illumination during inspection. This will cause the vehicle to fail the test, although the vehicle itself has no problem. | PCM sensitive to OBD tool connect or disconnect to DLC with ignition in the “On” position, or when the engine is running. See TSB #01-024/05. If vehicle within VIN range reprogram PCM and TCM. Or Earlier Emission Recall TSB #1303F to Reprogram PCM applicable to certain VINs. | Follow OIS prompts. Connect/disconnect DAD when key off. |
| Mitsubishi Fuso | 1998-2004 | FE639/FG639 [GVWR 10,001 –14,000] (diesel) [Federal certified] | Vehicle is not equipped with OBDII. | OBD not required in federally certified vehicles in this GVWR range during these years. | OIS programmed to skip the OBD functional test. |
| Mitsubishi | 2000-2001 | Montero, Montero Sport, Diamante, 3000GT Mirage, Galant, Expo/Expo LRV, and Eclipse models (except 2.0L non—turbo 420A engine models). | Fail for monitor readiness. | Some monitors are difficult to complete. | Follow recommended drive cycles. See Mitsubishi service manual. |
| Nissan | 1999-2007 | UD1200, [GVWR 10,001-14,000] (Diesel) [Federal certified] | Vehicle is not equipped with OBDII. | OBD not required in federally certified vehicles in this GVWR range during these years. | OIS programmed 2/26/2016 to skip the OBD functional test. |
| Nissan | 2000-2001 | Maxima | Failure to set catalyst monitor. | Only OEM scan tool shows OBD catalyst code. | Test catalyst and replace if defective. |
| Nissan | 2000-2006 | All models | Fail for monitor readiness. | Incomplete monitors during normal driving. Follow drive cycle for that specific year, make, model, engine, certification, transmission. Run entire drive pattern even if only one monitor unset. | Follow drive cycle. See owner’s manual. |
| Plymouth | 1999-2000 | Voyager with 3.0L engine built after 12/1/1998 | EGR Monitor will not complete at high altitude. | Reflash available. Confirm all systems functioning. Erase and reprogram PCM per TSB 18-03-00. | Vehicle requires reflash. Repair per TSB, run monitors then retest. |
| Plymouth | 2000 | Voyager 3.3L V-6 (E-85) | Readiness monitors will not set on certain flex fuel models, VINs listed below. WCRXT03.32BP (VIN 8th digit: G). | All monitors disabled for operation >E30 and ethanol fuel content learning. | OIS ignores all 11 readiness monitors. |
| Suzuki | 2001 | Aerio | Fail for monitor readiness. | Monitors can be difficult to complete. | Follow drive cycle. See OBD Clearinghouse or Suzuki service information. |
| Suzuki | 2004 | Forenza | Fail for monitor readiness. | Monitors can be difficult to complete. | Follow drive cycle. See OBD Clearinghouse or Suzuki service information. |
| Toyota | 2000-2006 | All models | Fail for monitor readiness. | Monitors can be difficult to complete. | Follow drive cycle. See Toyota service information. |
| Toyota | 2003-2004 | 4 Runner | Vehicle Stability Control (VSC) light may illuminate if CAN protocol attempted with aftermarket scan tool. | Vehicle loses stability control calibration when CAN protocol attempted. Follow service procedure to reset zero-point calibration. | OIS will not attempt to communicate via CAN protocol on these vehicles. |
| Toyota | 2007 | Highlander Hybrid | Fail for oxygen sensor (air/fuel) monitor readiness. | Air Fuel monitor issue. Perform software update to vehicle at no charge per Toyota Special Service Campaign F0P, dated August 20, 2015 and TSB #0042-15. | If fails for incomplete oxygen sensor monitor, advise motorist recall may be required. Recall status: use https://www.toyota.com/recall. |
| Volvo | 2000 | S40 / V40 | Failure to set Comprehensive, Oxygen sensor, and Catalyst monitors. | Defective ECM. | Send to Referee for inspection only if comprehensive, oxygen sensor, and catalyst monitors unset. If any additional failures exist, they must be repaired before the Referee inspection. |
| Volvo | 2004-2006 | S40, V50 | Air conditioning readiness monitor mistakenly set to supported instead of unsupported. | Vehicle design anomaly. | OIS ignores A/C monitor status. |
| Volvo | 2005-2007 | XC90 | Air conditioning readiness monitor mistakenly set to supported instead of unsupported. | Vehicle design anomaly. | OIS ignores A/C monitor status. |
| VW | 2000-2005 | Passat | May fail for no OBD communication. No response or Only Transmission Control Module responds to DADs requests. ABS and/or brake lamp illuminated in instrument panel cluster | Broken ground bond wire in ABS module causes diagnostic communication issues with the ABS module, ECM, and TCM. Diagnose and repair per VW TSB #45 15 01, dated September 21, 2015. | Likely Broken Vehicle Repair and Retest. |
This table lists vehicles known to have specific OBD testing issues that might affect the ability to call pass OBD2. Inspectors should consult this list to understand potential challenges and follow the provided instructions for each vehicle.
Permanent Diagnostic Trouble Code Vehicles of Interest
Certain vehicles are known to have issues with Permanent Diagnostic Trouble Codes (PDTCs) that may prevent them from clearing, even after the underlying problem has been resolved. This can lead to a vehicle failing the OBD test despite being properly repaired, making it crucial to understand which vehicles are affected and how to handle them to accurately call pass OBD2 or fail.
| Make | Year | Model Engine (L); Fuel Type | Issue | Cause and Possible Remedy | Instructions to Inspector |
|---|---|---|---|---|---|
| Audi | 2010 | Q7; 3.0 (TDI/diesel) | Permanent Fault Codes P0087, P0088, and P053F will not clear if present. | No remedy is available. | Test normally. BAR-OIS ignores these codes. |
| Audi | 2011-2012 | Q7; 3.0 (TDI/diesel) | Permanent Fault Codes P0087, P0088, P053F, P064A, P2635, and P0230 will not clear if present. | No remedy is available. | Test normally. BAR-OIS ignores these codes. |
| Chrysler | 2011-2015 | 200; 2.4, 3.6 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Chrysler | 2010-2014 | 300; 3.6, 5.7, 6.4 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Chrysler | 2017 | Pacifica Hybrid | Vehicle fails for PDTC C2200 or B22A9-00. | Reflash modules per TSB 08-005-21 and 08-006-21 | Reflash then retest. |
| Chrysler | 2018 | Pacifica Hybrid | Vehicle fails for PDTC C2200 or B22A9-00. | Reflash modules per TSB 08-008-21 and 08-009-21 | Reflash then retest. |
| Chrysler | 2019 | Pacifica Hybrid | Vehicle fails for PDTC C2200 or B22A9-00. | Reflash modules per TSB 08-011-21 and 08-012-21 | Reflash then retest. |
| Chrysler | 2011-2015 | Town and Country; 3.6 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2011-2014 | Avenger | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2011-2012 | Caliber; 2.0, 2.4 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2011-2015 | Challenger; 3.6, 5.7, 6.4 | Vehicle fails for Permanent Fault Code U0140. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2011-2014 | Charger; 3.6, 5.7, 6.4 | Vehicle fails for Permanent Fault Code U0140. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2011-2015 | Grand Caravan; 3.6 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2010-2011 | Dakota; 3.7, 4.7 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2013 | Dart; 2.0 | Vehicle fails for Permanent Fault Code U0140. | Reflash per Recall V50 and V51. | Reflash then retest. |
| Dodge | 2013 | Dart; 2.4 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2014-2015 | Dart; 2.0, 2.4 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2011-2014 | Durango; 3.6, 5.7 | Vehicle fails for Permanent Fault Code U0140. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2011-2015 | Journey; 2.4, 3.6 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Dodge | 2010-2011 | Nitro; 3.7, 4.0 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Ford | 2011-2014 | Mustang; 3.7 & 5.0 (gasoline) | Vehicle fails for Permanent Fault Code P0315. | Vehicle not self-clearing permanent fault code. | Refer the motorist to Ford for Customer Satisfaction Program 17N01. |
| Freightliner | 2014-2015 | Sprinter 2500 Sprinter 3500 (diesel) | Vehicle fails for Permanent Fault Codes P202A, P203A, P208A, P20B9, P20BD, P20BE or P20FA. | Vehicle not self-clearing permanent fault code. | Test normally. BAR-OIS will ignore these codes. |
| Jeep | 2014-2015 | Cherokee; 2.4, 3.2 | Vehicle fails for Permanent Fault Code U0140. | Reflash per Recall V51. | Reflash then retest. |
| Jeep | 2010 | Commander; 5.7 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Jeep | 2010-2015 | Grand Cherokee; 3.6, 5.7, 6.4 | Permanent Fault Codes will not clear | Reflash per Recall V51. | Reflash then retest. |
| Jeep | 2014-2017 | Grand Cherokee (diesel) | Vehicle fails for Permanent Fault Code P1D30. | Vehicle not self-clearing permanent fault code. | Test normally. BAR-OIS will ignore this code. |
| Jeep | 2010-2012 | Liberty; 3.7 | Permanent Fault Codes will not clear | Reflash per Recall V51. | Reflash then retest. |
| Jeep | 2011-2015 | Patriot / Compass; 2.0, 2.4 | Permanent Fault Codes will not clear | Reflash per Recall V51. | Reflash then retest. |
| Jeep | 2010-2015 | Wrangler; 3.6, 3.8 | Permanent Fault Codes will not clear | Reflash per Recall V51. | Reflash then retest. |
| Mercedes | 2010-2013 | 350 Bluetec | Vehicle fails for Permanent Fault Codes P203D, P20B6, P20BD or P20BE | Vehicle not self-clearing permanent fault code. | Test normally. BAR-OIS will ignore these codes. |
| Mercedes | 2014-2015 | Sprinter 2500 Sprinter 3500 (diesel) | Vehicle fails for Permanent Fault Codes P202A, P203A, P208A, P20B9, P20BD, P20BE or P20FA. | Vehicle not self-clearing permanent fault code. | Test normally. BAR-OIS will ignore these codes. |
| Ram | 2010-2014 | 1500; 3.6, 3.7, 4.7, 5.7 | Vehicle fails for Permanent Fault Code U0140. | Reflash per Recall V51. | Reflash then retest. |
| Ram | 2013 | 1500; 3.6, 5.7 | Permanent Fault Codes will not clear. | Reflash per Recall V50. | Reflash then retest. |
| Ram | 2014-2017 | 1500 (diesel) | Vehicle fails for Permanent Fault Code P1D30. | Vehicle not self-clearing permanent fault code. | Test normally. BAR-OIS will ignore this code. |
| Ram | 2010-2015 | 2500; 5.7, 6.4 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Ram | 2011-2015 | 3500 Cab Chassis; 5.7, 6.4 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Ram | 2013-2015 | 3500 Pickup; 5.7, 6.4 | Permanent Fault Codes will not clear. | Reflash per Recall V51. | Reflash then retest. |
| Ram | 2014 | Promaster; 3.6 | Permanent Fault Codes will not clear. | Reflash per Recall V50. | Reflash then retest. |
| Volkswagen | 2010 | Touareg; 3.0 (TDI/diesel) | Permanent Fault Codes P20B5, P0087, P0088, and P053F will not clear if present. | No remedy is available. | Test normally. BAR-OIS ignores these codes. |
| Volkswagen | 2011-2012 | Touareg; 3.0 (TDI/diesel). | Permanent Fault Codes P20B5, P0087, P0088, P053F, P064A, P2635, and P0230 will not clear if present. | No remedy is available. | Test normally. BAR-OIS ignores these codes. |
This table details vehicles known to have issues with PDTCs. For these vehicles, understanding the specific fault codes and recommended actions is vital to accurately call pass OBD2 or fail, and to provide appropriate guidance to vehicle owners.
BAR-97 EIS Vehicles of Interest
For older vehicles (model year 1996-1999) undergoing BAR-97 EIS inspections, certain models may present monitor readiness issues. In many cases, the BAR-97 EIS system is designed to accommodate these vehicle-specific anomalies, allowing for a more practical approach to determine if a vehicle will call pass OBD2.
| Make | Year | Model Engine (L); Fuel Type | Issue | Cause and Possible Remedy | Instructions to Inspector |
|---|---|---|---|---|---|
| BMW | 1996 | 7-Series, 8-Series 5.0L, 5.4L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Chrysler | 1996 | Cirrus, Concord, LHS Sebring Convertible | All monitors reset to incomplete upon every ignition key-off. | Recall campaign #678 applies to California certified vehicles originally sold in California. TSB #18-005-01 (with lifetime warranty) applies to federal certified and California certified originally sold in northeast states. | Comply with recall, then test as normal. |
| Chrysler | 1996 | Concord, LHS, New Yorker, Sebring, Town & Country 2.0L, 2.4L, 2.5L, 3.3L, 3.5L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Chrysler | 1998-1999 | Town & Country 3.3L Flex Fuel | Monitors may not function when ethanol is detected by the vehicle. | Test as normal. | |
| Dodge | 1996 | Stratus, Intrepid, Neon | All monitors reset to incomplete upon every ignition key-off. | Recall campaign #678 applies to California certified vehicles originally sold in California. TSB #18-005-01 (with lifetime warranty) applies to federal certified and California certified originally sold in northeast states. | Comply with recall, then test as normal. |
| Dodge | 1996 | Avenger, Stratus 2.0L manual | Monitors difficult to complete. | EIS ignores readiness status. | |
| Dodge | 1996 | Stealth 3.0L | All monitors reset to incomplete upon every ignition key-off. | These vehicles are not reflashable. | EIS ignores readiness status. |
| Dodge | 1998-1999 | Caravan 3.3L Flex Fuel | Monitors may not function when ethanol is detected by the vehicle. | Test as normal. | |
| Eagle | 1996 | Vision | All monitors reset to incomplete upon every ignition key-off. | Recall campaign #678 applies to California certified vehicles originally sold in California. TSB #18-005-01 (with lifetime warranty) applies to federal certified and California certified originally sold in northeast states. | Comply with TSB, then test as normal. |
| Eagle | 1996-1997 | Talon 2.0L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Ford | 2020-2022 | F-53 Motorhome, F-59 Commercial Stripped Chassis; Gasoline (not hybrid) | May fail for no OBD communication. | Design issue. Software update available. | Test normally. If the vehicle you are inspecting fails the OBD test for no communication, direct the vehicle to a Ford dealership for a software update. Issue may be due to software in gateway module—see SSM 50974. |
| Ford | 2021-2023 | F-650, F-750; all engines; Gasoline (not hybrid) | May fail for no OBD communication. | Design issue. Software update available. | Test normally. If the vehicle you are inspecting fails the OBD test for no communication, direct the vehicle to a Ford dealership for a software update. Issue may be due to software in gateway module—see SSM 50974. |
| Hyundai | 1996 | Accent 1.5L Elantra 1.8L Sonata 2.0L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Hyundai | 1997-1998 | Sonata 2.0L, 3.0L | Monitors difficult to complete. | EIS ignores readiness status. | |
| lnfiniti | 1996 | All models | Catalyst and evaporative system monitors are difficult to complete. | Follow drive cycle for specific vehicle model per TSB #ITB98-011F, June 7, 2013. | Test as normal. |
| Kia | 1996 | Sephia Sportage | Monitors difficult to complete. | EIS ignores readiness status. | |
| Lexus | 1996-1999 | All models | Monitors can be difficult to complete. | Follow drive cycles in Lexus service information. | Test as normal. |
| Mercedes-Benz | 1996 | C220, E320, C280, S320, SL320 | The MIL illuminates when a scan tool is connected to the DLC. Trouble codes are not stored. | If the OBD II connector is used as the RPM source during the Smog Check, the MIL will illuminate. | Do not connect the OBD II connector until the analyzer prompts for the OBD II functional test. Use the conventional contact or non-contact method to obtain an rpm signal. |
| Mitsubishi | 1996-1997 | All Models | Monitors difficult to complete. | EIS ignores readiness status. | |
| Mitsubishi | 1998 | Eclipse (all), Galant 2.4L, Mirage, Montero Sport 2.4L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Mitsubishi | 1998 | 3000GT, Diamante, Galant 2.3L, Montero, Montero Sport 3.0L | Some monitors are difficult to complete. | Follow recommended drive cycles in Mitsubishi service manual. | Test as normal. |
| Mitsubishi | 1999 | All models | Some monitors are difficult to complete. | Follow recommended drive cycles in Mitsubishi service manual. | Test as normal. |
| Nissan | 1996 | Sentra 1.6L and 2.0L manual, 200SX 1.6L, 240SX 2.4L, Maxima 3.0L, Pickup 2.4L | Monitors difficult to complete. | EIS ignores readiness status. | |
| Nissan | 1996-1997 | All models | Catalyst and evaporative system monitors are difficult to complete. | Follow recommended drive cycle for specific model per Nissan TSB #NTB98-018G, June 7, 2013. | Comply with TSB, then test as normal. |
| Nissan | 1999 | All models | Monitors can be difficult to complete. | Follow owner’s manual drive cycle to achieve readiness. | Test as normal. |
| Plymouth | 1996 | Breeze, Neon | All monitors reset to incomplete upon every ignition key-off. | Recall campaign #678 applies to California certified vehicles originally sold in California. TSB #18-005-01 (with lifetime warranty) applies to federal certified and California certified originally sold in northeast states. | Comply with recall, then test as normal. |
| Plymouth | 1998-1999 | Voyager 3.3L Flex Fuel | Monitors may not function when ethanol is detected by the vehicle. | Test as normal. | |
| Saab | 1996-1998 | 900 2.3L (B234 with Motronic 4.1) | Monitors difficult to complete. | EIS ignores readiness status. | |
| Saab | 1996-1998 | All models | Catalyst and evaporative system monitors are difficult to complete. | Saab Service Instruction No. 248-9037 describes the correct drive cycle for completion of the monitors. | Comply with TSB, then test as normal. |
| Subaru | 1996 | All models | Readiness cleared at key-off. | EIS ignores readiness status. | |
| Toyota | 1996-1999 | All models | Monitors can be difficult to complete. | Follow drive cycles in Toyota service information. | Test as normal. |
| Toyota | 1996-1997 | Tercel, Paseo | Evaporative system monitor will never complete or is unsupported. | The EIS allows any one monitor to be incomplete. Test as normal. | |
| VW | 1997-1999 | Passat | May fail for no OBD communication. No response or Only Transmission Control Module responds to DADs requests. ABS and/or brake lamp illuminated in instrument panel cluster. | Broken ground bond wire in ABS module causes diagnostic communication issues with the ABS module, ECM, and TCM. Diagnose and repair per VW TSB #45 15 01, dated September 21, 2015. | Likely Broken Vehicle. Repair and retest. |
| Volvo | 1996-1998 | All models | Monitors difficult to complete. | Follow recommended drive cycles in Service Bulletin 25-19 | EIS ignores readiness status. |
This table provides guidance for inspectors working with older vehicles, outlining specific makes and models where monitor readiness issues are known and how the BAR-97 EIS system handles these situations to determine if a vehicle will call pass OBD2.
Conclusion
Accurately determining whether a vehicle will call pass OBD2 during a smog check requires a thorough understanding of OBD pass/fail standards. This guide has outlined the key criteria, including readiness monitors, MIL function, communication protocols, PDTCs, and software integrity. Furthermore, it has highlighted specific vehicles known to have OBD testing anomalies. By utilizing this information, automotive technicians and smog check inspectors can enhance their testing accuracy and efficiency, ensuring vehicles on the road meet required emission standards. For further in-depth diagnostics and repair related to OBD systems, always consult manufacturer-specific service information and technical service bulletins.
