Understanding your vehicle’s health is crucial for every car owner. Modern vehicles are equipped with sophisticated onboard diagnostic systems, and accessing Obd2 Live Data Values is like getting a real-time health check for your engine and related systems. This guide will delve into the world of OBD2 live data, explaining what these values mean and how they can help you diagnose potential issues, ensuring your vehicle runs smoothly and efficiently.
Decoding Vehicle Operation Parameters
OBD2 live data provides a wealth of information about your vehicle’s operation. These parameters offer insights into the engine’s performance, speed, and various temperature readings, helping you understand how different components are functioning in real-time.
Engine RPM (Revolutions Per Minute)
Engine RPM, or Revolutions Per Minute, measures how fast your engine’s crankshaft is rotating. It’s a fundamental OBD2 live data value indicating engine speed. Higher RPMs generally mean higher engine output and speed, while idle RPM is lower. Monitoring RPM is crucial for understanding engine load and performance under different driving conditions.
Vehicle Speed
This straightforward OBD2 live data value displays the current speed of your vehicle. It’s typically derived from wheel speed sensors and is a key parameter for cruise control, transmission control, and overall vehicle operation monitoring. Discrepancies between vehicle speed from OBD2 and the speedometer can sometimes indicate sensor issues or calibration problems.
Engine Coolant Temperature
Engine Coolant Temperature is a critical OBD2 live data value that reflects the temperature of the engine coolant. This reading, usually obtained from a sensor near the engine block, is vital for preventing engine overheating. The Engine Control Unit (ECU) uses this information to manage engine cooling fans and adjust fuel injection. High coolant temperature readings can signal problems with the cooling system, such as a failing thermostat, water pump, or radiator issues.
Engine Oil Temperature
While not available on all vehicles via OBD2, Engine Oil Temperature is an important OBD2 live data value for performance and engine longevity. Measured by sensors like thermocouples, thermistors, or RTDs, oil temperature monitoring helps ensure the oil stays within its optimal working range. Overheated oil can lose its lubricating properties, leading to increased engine wear. Tracking this value is particularly useful for high-performance driving or towing.
Ambient Air Temperature
Ambient Air Temperature, measured by a sensor typically located near the front bumper, provides the temperature of the air outside your vehicle. This OBD2 live data value is used by the ECU to adjust fuel mixture and ignition timing. Colder air is denser and requires a richer fuel mixture for optimal combustion.
Barometric Pressure
Barometric Pressure, or Atmospheric Pressure, is measured by a BARO sensor. This OBD2 live data value is essential for the Powertrain Control Module (PCM) to calculate air density and adjust fuel trim and engine timing accordingly. At sea level, average barometric pressure is around 14.7 PSI. Changes in barometric pressure due to altitude or weather conditions affect engine performance, and the PCM uses this data to compensate.
Accelerator Pedal Position
Accelerator Pedal Position sensors monitor the position of the gas pedal. This OBD2 live data value indicates driver demand for power and is directly linked to throttle control. Multiple sensors are often used for redundancy and accuracy.
Relative Accelerator Pedal Position
Relative Accelerator Pedal Position refines the accelerator pedal reading. This OBD2 live data value might not always show 100% even when the pedal is fully depressed. It’s calculated based on sensor output voltages and can represent an average value from multiple sensors, depending on the vehicle.
Commanded Throttle Actuator
Commanded Throttle Actuator position reflects the throttle position requested by the ECU based on the accelerator pedal input and other factors. This OBD2 live data value shows the ECU’s intended throttle opening, which might differ slightly from the actual throttle position due to various control algorithms.
Relative Throttle Position
Relative Throttle Position compares the current throttle position to a learned closed position. This OBD2 live data value accounts for changes over time, such as carbon buildup in the throttle body, which can affect throttle behavior. The ECU adjusts the throttle position to compensate for these changes, ensuring consistent performance.
Absolute Throttle Position
Absolute Throttle Position is the actual, measured opening of the throttle valve. This OBD2 live data value is typically expressed as a percentage, with 0% being fully closed and 100% fully open. It’s a direct reading of the throttle’s physical position.
Control Module Voltage
Control Module Voltage indicates the voltage supplied to the ECU. This OBD2 live data value should be close to the system voltage when the vehicle is running but is not the same as battery voltage. Monitoring this value can help diagnose electrical system issues affecting the ECU’s operation.
Hybrid Battery Pack Remaining Life
For hybrid vehicles, Hybrid Battery Pack Remaining Life shows the charge percentage of the hybrid battery. This OBD2 live data value provides a general indication of the battery’s state of charge but standard OBD2 typically does not provide individual cell data.
Hybrid/EV Vehicle System Status
This OBD2 live data value offers insights into hybrid and electric vehicle systems, including:
- HEV Charging State: Indicates whether the hybrid system is in Charge Sustaining Mode (CSM) to maintain charge or Charge Depletion Mode (CDM) to use up battery charge. Non-PHEVs typically operate in permanent CSM.
- HEV Battery Voltage: Voltage of the hybrid battery pack, ranging from 0V to 1024V.
- HEV Battery Current: Current flow in or out of the hybrid battery, with negative values indicating charging. Range is typically -3300 Amps to 3300 Amps.
Calculated Engine Load Value
Calculated Engine Load Value represents the percentage of maximum engine load. This OBD2 live data value is calculated using the Mass Air Flow (MAF) sensor reading and provides an indication of how hard the engine is working. Higher values mean greater engine load. Altitude correction is factored into peak airflow calculations.
Absolute Load Value
Absolute Load Value is a normalized percentage representing air mass per intake stroke relative to air mass at 100% throttle. This OBD2 live data value provides another perspective on engine load and may differ depending on vehicle state (idle, parking, accessories on/off).
Driver’s Demand Engine – Percent Torque
Driver’s Demand Engine – Percent Torque indicates the percentage of maximum engine torque requested by the driver based on accelerator pedal position, cruise control, and transmission demands. This OBD2 live data value reflects the driver’s torque request as interpreted by the ECU. External factors like traction control usually do not affect this value.
Actual Engine – Percent Torque
Actual Engine – Percent Torque, also known as Indicated Torque, shows the current percentage of available engine torque. This OBD2 live data value accounts for net brake torque and friction torque required to run the engine without load. It represents the engine’s actual torque output at a given moment.
Engine Friction – Percent Torque
Engine Friction – Percent Torque represents the percentage of engine torque lost to friction from internal components, accessories (water pump, alternator, etc.), and emissions control equipment when the engine is running without an external load. This OBD2 live data value highlights the engine’s internal losses.
Engine Reference Torque
Engine Reference Torque is a fixed torque rating considered 100% for Actual Engine Percentage Torque and other torque-related OBD2 live data values. This value is constant and serves as a baseline for torque calculations.
Engine Percent Torque Data
Engine Percent Torque Data is a general parameter used when vehicle conditions may cause the torque reference to change. This OBD2 live data value is relevant in dynamic driving situations where torque demands fluctuate.
Auxiliary Input/Output
Auxiliary Input/Output is a composite OBD2 live data value that can provide status details for various vehicle systems, including:
- Power Take Off (PTO) and Glow Plug Lamp status (On/Off).
- Automatic Transmission Park/Neutral or Drive/Reverse status.
- Manual Transmission Neutral/Clutch In or In Gear status.
- Recommended Transmission Gear (1 to 15).
Exhaust Gas Temperature (EGT)
Exhaust Gas Temperature (EGT) is measured by sensors placed in the exhaust system to protect components from overheating. Key locations for EGT sensors include the turbocharger, catalytic converter, diesel particulate filter, and NOx reduction system components. Monitoring EGT via OBD2 live data values is crucial for preventing damage to these sensitive parts, especially in turbocharged or diesel vehicles.
Engine Exhaust Flow Rate
Engine Exhaust Flow Rate measures the flow rate of the air-fuel mixture after combustion. This OBD2 live data value is calculated using exhaust temperature, volumetric efficiency, engine size, and RPM. It provides insight into engine breathing and combustion efficiency.
Exhaust Pressure
Exhaust Pressure is displayed as an absolute pressure value when the engine is running and near ambient atmospheric pressure when off. This OBD2 live data value can help diagnose exhaust system restrictions. Some vehicles report data from one or two exhaust locations.
Manifold Surface Temperature
Manifold Surface Temperature is the temperature of the exhaust manifold’s outer surface. This OBD2 live data value can indicate potential exhaust system issues or overheating concerns.
Timing Advance for #1 Cylinder
Timing Advance for #1 Cylinder refers to the ignition timing relative to Top Dead Center (TDC) for cylinder #1. This OBD2 live data value is manufacturer-specific and indicates the angle before or after TDC at which the spark plug fires. Positive values mean delayed firing, negative values mean firing before TDC.
Engine Run Time
Engine Run Time parameters provide various measures of engine operating duration:
- Engine Run Time in Seconds: Total time the engine has been running.
- Engine Idle Time In Seconds: Total time the engine has been idling.
- Engine Run Time when PTO is engaged: Run time specifically with Power Take-Off engaged.
These OBD2 live data values are useful for tracking engine usage and maintenance intervals.
Run Time Since Engine Start
Run Time Since Engine Start is the total time in seconds the engine has run since it was last started. This OBD2 live data value resets with each engine start cycle.
Time Run with MIL On
Time Run with MIL On tracks the total engine run time since the Malfunction Indicator Lamp (MIL), or check engine light, was activated. This OBD2 live data value starts counting when a trouble code triggers the MIL and helps assess how long a fault condition has been present.
Distance Traveled while MIL is Activated
Distance Traveled while MIL is Activated measures the total distance the vehicle has traveled since the check engine light came on. This OBD2 live data value resets when codes are cleared or the battery is disconnected.
Time since Trouble Codes Cleared
Time since Trouble Codes Cleared is the total engine run time since diagnostic trouble codes were last cleared, either by an OBD2 scan tool or battery disconnection. This OBD2 live data value helps track time elapsed since the last diagnostic reset.
Distance Traveled Since Codes Cleared
Distance Traveled Since Codes Cleared measures the total distance the vehicle has traveled since trouble codes were cleared. This OBD2 live data value persists even if non-engine codes are cleared and resets only with OBD2 code clearing or battery disconnection.
Warm-ups Since Codes Cleared
Warm-ups Since Codes Cleared counts the number of engine warm-up cycles since the last code clearing. A warm-up cycle, for the purpose of this OBD2 live data value, is defined as coolant temperature reaching at least 40°F after startup and then reaching at least 170°F. This parameter is useful for emissions diagnostics and monitoring system readiness.
Fuel and Air System Data Points
Monitoring fuel and air system parameters is essential for engine efficiency and emissions control. OBD2 live data values in this category provide insights into fuel delivery, air intake, and combustion processes.
Fuel System Status
Fuel System Status indicates the operating mode of the fuel system. Common modes, represented as OBD2 live data values, are Open Loop and Closed Loop:
- Open Loop Modes: The ECU uses pre-programmed air-fuel ratios, ignoring oxygen sensor feedback.
- Closed Loop Mode: The ECU uses oxygen sensor feedback to adjust the air-fuel ratio for optimal combustion and emissions.
Oxygen Sensor Voltage
Oxygen Sensor Voltage measures the voltage generated by the oxygen sensor(s) in the exhaust stream. This OBD2 live data value typically ranges from 0.1V to 0.9V. A sensor within this range is generally considered to be functioning correctly. Oxygen sensors are crucial for closed-loop fuel control.
Oxygen Sensor Equivalence Ratio (Lambda)
Oxygen Sensor Equivalence Ratio, also known as Lambda, is another key OBD2 live data value derived from oxygen sensors. In closed loop mode, it informs the ECU to adjust the air-fuel mixture. In open loop, it’s generally not used for control.
Oxygen Sensor Current
Oxygen Sensor Current measures the current flow within the oxygen sensor. A 0mA reading, as an OBD2 live data value, indicates a balanced air-fuel ratio. Positive current suggests a lean mixture (excess air), while negative current indicates a rich mixture (excess fuel).
Short Term Fuel Trim
Short Term Fuel Trim (STFT) represents immediate, real-time adjustments the ECU makes to the fuel mixture based on oxygen sensor readings. As an OBD2 live data value, STFT shows the percentage of fuel being added or removed. Positive values indicate fuel is being added (to compensate for a lean condition), and negative values indicate fuel is being reduced (to correct a rich condition).
Long Term Fuel Trim
Long Term Fuel Trim (LTFT) reflects more persistent adjustments the ECU makes to the fuel mixture over time. This OBD2 live data value compensates for gradual changes in engine or sensor conditions. LTFT values update relatively slowly but are stored in the ECU’s memory.
Commanded Equivalence Ratio (CER)
Commanded Equivalence Ratio (CER), or lambda, represents the air-fuel ratio target requested by the ECU. This OBD2 live data value behaves differently depending on the oxygen sensor type:
- Wide Range O2 Sensors: CER is displayed in both open and closed loop modes.
- Conventional O2 Sensors: CER is displayed in open loop mode. In closed loop, it typically shows 1.0, indicating stoichiometric ratio.
Mass Air Flow Rate (MAF)
Mass Air Flow Rate (MAF) measures the amount of air entering the engine. This OBD2 live data value is typically in grams per second (g/s). At idle, MAF readings should be in the 2-7 g/s range, rising to 15-25 g/s at 2500 RPM. Consult manufacturer specifications for precise values for your vehicle.
Intake Air Temperature (IAT)
Intake Air Temperature (IAT) measures the temperature of the air entering the engine cylinders. This OBD2 live data value is obtained from IAT sensors. Vehicles may have multiple IAT sensors for different purposes, such as measuring air entering the engine, climate control system intake, or ambient air temperature.
Intake Manifold Absolute Pressure (MAP)
Intake Manifold Absolute Pressure (MAP) is measured by a sensor in the intake manifold. This OBD2 live data value indicates the pressure inside the intake manifold. A running engine typically shows 18-20 “Hg vacuum, while an idling engine might show 0-20 “Hg vacuum. MAP sensor data is crucial for determining air density and adjusting fuel delivery.
Fuel Pressure (Gauge)
Fuel Pressure (Gauge) is the fuel pressure reading in the fuel system, displayed as a gauge pressure value. This OBD2 live data value means 0 indicates atmospheric pressure.
Fuel Rail Pressure
Fuel Rail Pressure also represents fuel pressure in the fuel rail, displayed as a gauge pressure. Similar to Fuel Pressure (Gauge), a 0 psi/kPa reading for this OBD2 live data value indicates atmospheric pressure.
Fuel Rail Pressure (Absolute)
Fuel Rail Pressure (Absolute) is the fuel pressure in the fuel rail, but displayed as an absolute pressure value. This OBD2 live data value will show ambient pressure (around 14.7 psi or 101.3 kPa) when the fuel rail is not pressurized.
Fuel Rail Pressure (relative to manifold vacuum)
Fuel Rail Pressure (relative to manifold vacuum) provides the fuel pressure value relative to the intake manifold vacuum. This OBD2 live data value is useful for diagnosing fuel delivery issues under different engine load conditions.
Alcohol Fuel %
Alcohol Fuel % indicates the percentage of ethanol or alcohol content in the fuel, as measured by the engine computer. For example, E85 fuel would show approximately 85% for this OBD2 live data value.
Fuel Level Input
Fuel Level Input displays the percentage of maximum fuel tank capacity remaining. This OBD2 live data value is a straightforward representation of your fuel level.
Engine Fuel Rate
Engine Fuel Rate is the near-instantaneous fuel consumption rate, typically expressed in Liters or Gallons per hour. This OBD2 live data value is calculated by the ECU based on fuel used in the last 1000ms. Note that it usually does not include fuel consumed by diesel aftertreatment systems.
Cylinder Fuel Rate
Cylinder Fuel Rate represents the calculated amount of fuel injected per cylinder during the most recent intake stroke. This OBD2 live data value is displayed in milligrams per stroke (mg/stroke) and provides cylinder-specific fuel delivery information.
Fuel System Percentage Use
Fuel System Percentage Use shows the percentage of total fuel usage for each cylinder bank, up to four banks. This OBD2 live data value can also display data for separate fuel systems in vehicles that support them (e.g., diesel and CNG).
Fuel Injection Timing
Fuel Injection Timing indicates the angle of crankshaft rotation before Top Dead Center (BTDC) at which fuel injection begins. This OBD2 live data value is expressed in degrees. Positive angles are before TDC, negative angles are after TDC.
Fuel System Control
Fuel System Control provides status information for diesel vehicle fuel systems (system 1 and 2 if applicable). This OBD2 live data value may include:
- Fuel pressure control loop status (Open/Closed).
- Fuel injection quantity control loop status (Open/Closed).
- Fuel injection timing control loop status (Open/Closed).
- Idle fuel balance/contribution control loop status (Open/Closed).
“Closed loop” indicates sensor feedback is used for fine-tuning.
Fuel Pressure Control System
Fuel Pressure Control System parameters provide detailed data for up to two fuel rails, including:
- Commanded rail pressure.
- Actual rail pressure.
- Temperature.
All pressure values in this OBD2 live data value are typically gauge pressure.
Injection Pressure Control System
Injection Pressure Control System data is relevant for some diesel engines that use high-pressure oil to control fuel injection. This OBD2 live data value may display:
- Commanded Control Pressure Rail A.
- Actual Pressure Rail A.
- Commanded Control Pressure Rail B.
- Actual Pressure Rail B.
Boost Pressure Control
Boost Pressure Control parameters are crucial for turbocharged vehicles, displaying data for one or two turbochargers:
- ECM commanded boost pressure.
- Actual boost pressure.
All values in this OBD2 live data value are absolute pressure. When discussing boost, gauge pressure is often used (gauge pressure = absolute pressure – atmospheric pressure). This parameter also provides feedback on boost control system operating modes (Open Loop, Closed Loop, Fault Present).
Turbocharger RPM
Turbocharger RPM measures the rotational speed of the turbocharger turbine(s). This OBD2 live data value has a maximum reported value of 655,350 RPM.
Turbocharger Temperature
Turbocharger Temperature parameters provide various temperature readings related to the turbocharger system:
- Compressor inlet temperature (pre-turbo air charge temperature).
- Compressor outlet temperature (post-turbo air charge temperature).
- Turbine inlet temperature (pre-turbine exhaust temperature).
- Turbine outlet temperature (post-turbine exhaust temperature).
These OBD2 live data values are essential for monitoring turbocharger thermal conditions.
Turbocharger Compressor Inlet Pressure Sensor
Turbocharger Compressor Inlet Pressure Sensor reading is the pressure measured at the turbocharger inlet. This OBD2 live data value is an absolute pressure, with ambient atmospheric pressure around 14.7 psi / 101.3 kPa.
Variable Geometry Turbo (VGT) Control
Variable Geometry Turbo (VGT) Control parameters relate to the position of vanes in VGT systems used to optimize turbocharger performance. This OBD2 live data value includes:
- Commanded VGT Position (vane position requested by ECU, 0% = max bypass, 100% = max boost).
- Actual VGT Vane Position.
- VGT Control Status (Open Loop, Closed Loop, Fault State).
Wastegate Control
Wastegate Control parameters are relevant for turbocharged vehicles with wastegates, which bypass exhaust gas around the turbine to control boost. This OBD2 live data value reports:
- Commanded wastegate position (0% = fully closed, 100% = max bypass).
- Actual wastegate position.
Charge Air Cooler Temperature (CACT)
Charge Air Cooler Temperature (CACT) monitors the temperature of the air charge after the intercooler on turbocharged vehicles. This OBD2 live data value can provide readings from up to four sensors, though sensor mapping may be vehicle-specific.
Emissions Control System Parameters
Emissions control is a critical aspect of modern vehicles. OBD2 live data values related to emissions systems help monitor the performance of components designed to reduce harmful exhaust gases.
Commanded EGR
Commanded EGR indicates the desired opening percentage of the Exhaust Gas Recirculation (EGR) valve, as requested by the ECU. This OBD2 live data value ranges from 0% (fully closed) to 100% (fully open). EGR reduces NOx emissions by recirculating exhaust gas back into the intake.
EGR Error
EGR Error represents the percentage difference between the commanded and actual EGR valve opening. This OBD2 live data value can help diagnose EGR system malfunctions. Special note: if commanded EGR is 0%, EGR error will be 0% if actual is also 0%, but 99.2% if actual EGR is anything other than 0%, indicating “undefined” or not applicable.
Commanded Diesel Intake Air Flow Control
Commanded Diesel Intake Air Flow Control, sometimes called EGR Throttle, relates to a throttle plate used in some newer diesels to create intake vacuum for EGR purposes. This OBD2 live data value may report:
- Commanded position of the intake air flow throttle plate (0-100% closed to open).
- Actual position of the EGR throttle.
- Commanded position of a secondary EGR throttle (if fitted).
- Actual position of secondary EGR throttle.
Exhaust Gas Recirculation Temperature
Exhaust Gas Recirculation Temperature parameters provide up to four EGR temperature readings:
- EGRTA – Bank 1 Pre-Cooler.
- EGRTB – Bank 1 Post-Cooler.
- EGRTC – Bank 2 Pre-Cooler.
- EGRTD – Bank 2 Post-Cooler.
These OBD2 live data values monitor the effectiveness of EGR cooling.
EVAP System Vapor Pressure
EVAP System Vapor Pressure is the gauge pressure in the Evaporative Emission Control System (EVAP). This OBD2 live data value is measured by a sensor in the fuel tank or EVAP line and helps diagnose EVAP system leaks or blockages.
Absolute Evap System Vapor Pressure
Absolute Evap System Vapor Pressure is the absolute pressure in the EVAP system. As an OBD2 live data value, it provides an absolute pressure reading, where roughly 14.7 psi or 101.3 kPa indicates 0 gauge pressure.
Commanded Evaporative Purge
Commanded Evaporative Purge indicates the desired purge flow rate for the EVAP system, as requested by the ECU. This OBD2 live data value ranges from 0% (fully closed) to 100% (maximum purge flow). EVAP purge is used to vent fuel vapors from the fuel tank to the engine for combustion.
Catalyst Temperature
Catalyst Temperature measures the temperature of the catalytic converter. This OBD2 live data value may specify Bank # (engine side) and Sensor # (pre- or post-catalyst). Monitoring catalyst temperature is important for ensuring proper catalytic converter operation and preventing overheating damage.
Diesel Aftertreatment Status
Diesel Aftertreatment Status is a hybrid OBD2 live data value providing comprehensive information about diesel emissions control systems, including:
- Current DPF Regeneration Status (Active/Not Active).
- Current DPF Regeneration Type (Passive/Active).
- NOx Absorber Regen Status (Active/Not Active).
- NOx Absorber Desulfurization Status (Active/Not Active).
- Normalized Trigger for DPF Regen (% until next regen).
- Average Time Between DPF Regens.
- Average Distance Between DPF Regens.
Diesel Exhaust Fluid Sensor Data
Diesel Exhaust Fluid (DEF) Sensor Data parameters provide information about the DEF system used in many diesel vehicles for NOx reduction. This OBD2 live data value may include:
- DEF Type (Urea concentration status, sensor fault).
- DEF Concentration (Urea percentage, target ~32.5%).
- DEF Tank Temperature.
- DEF Tank Level (note: level readings may be discrete, not continuous).
Diesel Particulate Filter (DPF)
Diesel Particulate Filter (DPF) parameters monitor the condition of the DPF, which traps soot in diesel exhaust. This OBD2 live data value may include:
- Inlet pressure.
- Outlet pressure.
- Differential pressure across the DPF.
Increased differential pressure indicates soot accumulation and potential need for regeneration.
Diesel Particulate Filter (DPF) Temperature
Diesel Particulate Filter (DPF) Temperature parameters provide temperature readings for the DPF:
- Inlet temperature.
- Outlet temperature.
These OBD2 live data values are important for monitoring DPF thermal conditions during regeneration.
NOx Sensor
NOx Sensor parameters report Nitrogen Oxides (NOx) concentration levels in parts per million (ppm) from up to four sensors. This OBD2 live data value may specify Bank # and Sensor # (pre- or post-NOx adsorption system).
NOx Control System
NOx Control System parameters provide data related to the NOx reduction system, such as Selective Catalytic Reduction (SCR):
- Average Reagent Consumption Rate (DEF/urea).
- Average Demanded Consumption Rate.
- Reagent Tank Level (note: level readings may be discrete).
- NOx Warning Indicator Time (time since NOx warning light activation).
These OBD2 live data values help monitor the performance and status of the NOx reduction system.
NOx Sensor Corrected Data
NOx Sensor Corrected Data provides NOx concentration readings in ppm, including learned adjustments and offsets. This OBD2 live data value offers a refined NOx measurement.
NOx NTE Control Area Status
NOx NTE (Not-to-Exceed) Control Area Status parameters indicate whether the vehicle is operating within or outside the NOx emissions control area defined by regulations. This OBD2 live data value may report:
- Vehicle operation inside/outside NOx control area.
- Vehicle operation inside manufacturer exception (“carve-out”) region.
- NTE-related deficiency within the NOx control area.
PM Sensor Bank 1 & 2
PM Sensor Bank 1 & 2 parameters provide data from Particulate Matter (PM) sensors:
- Particulate matter sensor active (yes/no).
- Particulate matter sensor regenerating (yes/no).
- Particulate matter sensor value (0-100% soot accumulation).
These OBD2 live data values track soot levels as measured by PM sensors.
Particulate Matter (PM) Sensor
Particulate Matter (PM) Sensor readings provide soot concentration in mg/m3, as measured by PM sensors on bank 1 and 2. This OBD2 live data value gives a direct measurement of particulate matter.
PM NTE Control Area Status
PM NTE (Not-to-Exceed) Control Area Status parameters are similar to NOx NTE, but for particulate matter emissions. This OBD2 live data value may report:
- Vehicle operation inside/outside PM control area.
- Vehicle operation inside manufacturer exception (“carve-out”) region.
- NTE-related deficiency within the PM control area.
SCR Inducement System
SCR Inducement System parameters relate to strategies used to alert drivers to SCR system issues (e.g., low DEF). Inducement may involve warnings or functional restrictions. This OBD2 live data value reports current SCR inducement status and reasons for activation, as well as historical inducement occurrences.
NOx Warning And Inducement System
NOx Warning And Inducement System parameters provide detailed information on warning/inducement levels for NOx control issues. This OBD2 live data value may report:
- Warning/inducement levels (Level 1, 2, 3 severity).
- Status for each level (Inactive, Enabled but not active, Active, Not supported).
- Historical data on incorrect reagent use, consumption, dosing interruptions, and DTCs related to EGR and NOx control.
Engine Run Time for AECD
Engine Run Time for AECD (Auxiliary Emissions Control Device) parameters track the total time AECDs have been active. AECDs are permitted emissions control strategies that may temporarily reduce emissions control effectiveness under specific conditions. This OBD2 live data value reports time for each AECD, potentially with separate timers for different levels of emissions control inhibition.
By understanding these OBD2 live data values, you can gain a deeper insight into your vehicle’s operation, diagnose potential problems effectively, and ensure your car remains in optimal condition. Regular monitoring of live data with an OBD2 scanner is a valuable practice for proactive vehicle maintenance.
