The check engine light is on, and a wave of anxiety hits you. Before you rush to the mechanic, emptying your wallet for a diagnosis, know that you can take control. The best OBD2 scanners are your secret weapon, plugging into your car’s computer and revealing exactly what’s causing that mysterious dashboard warning. Whether you’re a seasoned car enthusiast or a first-time car owner, understanding your vehicle’s health is now easier and more affordable than ever thanks to these diagnostic tools.
Not all OBD2 scanners are created equal, and the market can seem overwhelming. That’s where we come in. As car experts at carparteu.com, we’ve put in the hours testing and evaluating a wide range of OBD2 scanners. We’ve sorted through the noise to bring you a curated list of the top performers for 2023, ensuring you find the perfect scanner to meet your needs and budget. Keep reading to discover our top picks and learn everything you need to know about OBD2 scanners, from how they work to deciphering those cryptic error codes.
Our top selections include the Topdon TopScan for its seamless wireless operation and comprehensive diagnostic capabilities, making it the best mobile OBD2 scanner. For those watching their budget, the Launch CR529 offers incredible value without sacrificing essential features. And if you’re looking for professional-grade diagnostics at your fingertips, the Topdon Phoenix Lite 2 delivers an experience comparable to what the pros use. Let’s dive into the details and find the best OBD2 scanner for you in 2023.
Here are our top picks for the best OBD2 scanners available on the market today.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, bringing expertise in hardware and mobile technology. His passion for electric vehicles and automotive tech makes him a reliable voice in the car tech space.
The Best OBD2 Scanners: Quick List
Based on our hands-on testing, here’s a quick overview of the best OBD2 scanners you can buy right now. Scroll down to explore detailed reviews and discover why these scanners stand out.
Best Mobile Scanner
1. Topdon TopScan
The Topdon TopScan is our top pick for mobile scanners, boasting effortless Bluetooth setup and a suite of professional-grade features packed into a compact design. From in-depth diagnostics to repair guidance, parts information, and even predictive analysis, this scanner empowers you to anticipate potential issues before they escalate.
Best Budget Scanner
2. Launch CR529
Don’t let the affordable price tag fool you. The Launch CR529 is a small but mighty OBD2 scanner that delivers essential diagnostic functions and even some advanced features typically found in higher-priced models. With lifetime support and updates included, this scanner is an exceptional value for any car owner.
Best Professional-Level Scanner
3. Topdon Phoenix Lite 2
Imagine a rugged, handheld device that’s as user-friendly as a tablet yet packed with professional diagnostic power. The Topdon Phoenix Lite 2 is designed for both seasoned mechanics and DIY enthusiasts who demand comprehensive scanning capabilities and durability. If you need a robust scanner that can handle demanding use, this is a top contender.
Best Dual-Purpose Scanner
4. Ancel BD310
The Ancel BD310 offers more than just OBD2 scanning. This versatile device can also function as an auxiliary dashboard display, providing real-time engine data in addition to its diagnostic capabilities. Its sleek design, smartphone compatibility, and reasonable price make it a standout dual-purpose scanner.
Best Scanner with Companion App
5. Carly OBD-II Scanner
Unlock a new level of vehicle interaction with the Carly OBD-II Scanner. The value of this scanner is heavily dependent on your car’s make, with brands like VW, BMW, and Ford benefiting the most from its extensive features. However, the Carly stands out with its exceptional companion app, offering customization and professional-level tests in an intuitive interface.
Detailed Reviews of the Best OBD2 Scanners
Why Trust Carparteu.com? Our team at Carparteu.com is dedicated to providing reliable and expert advice on car maintenance and technology. We conduct thorough, hands-on testing and analysis of products to help you make informed decisions. Learn more about our testing process.
Best Mobile OBD-II Scanner
(Image credit: Topdon)
1. Topdon TopScan
Perfect for Deep Dive Diagnostics on Your Smartphone
Read our expert review of the Topdon TopScan
Specifications:
- Display: None (App-based)
- Connectivity: Bluetooth
- Handheld: No
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: None (App-controlled)
- Warranty: 2 years
- Dimensions: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Exceptional vehicle diagnostic coverage
- Real-time live data monitoring
- Unique performance analysis tools
- Comprehensive maintenance functions
Reasons to Avoid:
- Larger Bluetooth adapter may feel bulky
- Advanced features require subscription after the first year
Don’t be deceived by its unassuming appearance; the Topdon TopScan packs serious diagnostic power into a compact Bluetooth module. This isn’t just a basic Bluetooth OBD2 adapter; it goes above and beyond typical scanners in its class. We were particularly impressed with its ability to not only identify faults and perform essential I/M readiness tests, but also to delve into vehicle performance and efficiency metrics. It can even estimate horsepower and torque figures, features rarely found even in scanners costing ten times more. Whether you aim to optimize your car’s performance or simply ensure its reliability, the Topdon TopScan is an invaluable tool to have in your garage.
Read our full Topdon TopScan review
Best Budget OBD-II Scanner
(Image credit: Future)
2. Launch CR529
Unbeatable Value for Money in an OBD2 Scanner
Read our expert review of the Launch CR529
Specifications:
- Display: 2.8-inch Color Screen
- Connectivity: Cable
- Handheld: Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: 8 Physical Buttons
- Warranty: 1 year
- Dimensions: 6.5 x 3.8 x 1.2 inches
- Weight: 11 ounces
Reasons to Buy:
- Extremely affordable
- Lifetime free updates
- Easy pre-inspection report generation
Reasons to Avoid:
- Lacks manufacturer-specific advanced codes
- May feel somewhat heavy
- Shorter 1-year warranty
The Launch CR529 redefines “budget-friendly” in the OBD2 scanner market. Priced incredibly affordably, it delivers a surprising level of diagnostic capability. We were impressed by the features packed into this scanner, especially considering its low cost. While compromises are expected at this price point, such as the absence of advanced manufacturer-specific codes and a slightly heavier feel, the CR529 still offers essential functions like live data streaming, instant vehicle health reports, and a remarkably detailed look into your car’s systems. The inclusion of lifetime free updates is a significant bonus, ensuring long-term value without subscription fees. While the CR529 might not satisfy professional mechanics seeking advanced features, it’s an excellent choice for everyday car owners needing a reliable and budget-conscious diagnostic tool.
Read our full Launch CR529 review
Best Professional-Level OBD-II Scanner
Tom Pritchard testing Topdon Phoenix Lite 2 OBD2 scanner
(Image credit: Future)
3. Topdon Phoenix Lite 2
Bridging the Gap Between DIY and Professional Car Diagnostics
Read our expert review of the Topdon Phoenix Lite 2
Specifications:
- Display: 8-inch Color Touchscreen
- Connectivity: Bluetooth & Wi-Fi
- Handheld: Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: Touchscreen Interface
- Warranty: 2 years
- Dimensions: 10.2 x 7.2 x 1.7 inches
- Weight: 2.6 pounds
Reasons to Buy:
- Professional-grade OBD2 scanning capabilities
- Versatile handheld with Wi-Fi and Bluetooth
- Large, intuitive 8-inch touchscreen
- Extensive diagnostic tests and live data options
- Includes adapters and protective hard case
Reasons to Avoid:
- Larger size and heavier weight
- Higher price point
- Subscription required for updates after two years
The Topdon Phoenix Lite 2 commands a higher price than many OBD2 scanners, but it justifies the investment with a feature set that blurs the lines between amateur and professional diagnostic tools. You’re getting a powerful scanner suitable for both experienced mechanics and serious DIYers. A standout feature is its wireless operation: the control tablet connects via Bluetooth to a compact adapter plugged into your car’s OBD port, providing exceptional freedom of movement around the vehicle. While the scanner itself is substantial in size and weight, it’s designed for workshop environments with a built-in kickstand and rugged construction. Beyond basic fault code reading, the Phoenix Lite 2 offers advanced features like live data graphing and in-depth fault information, rivaling much more expensive professional scanners. Keep in mind that firmware updates are included for two years, after which a yearly subscription is required.
Read our full Topdon Phoenix 2 Lite review
Best Dual-Purpose OBD-II Scanner
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
An OBD2 Scanner That Doubles as a Dashboard Display
Read our expert review of the Ancel BD310
Specifications:
- Display: 2-inch Color Screen
- Connectivity: Bluetooth & Cable
- Handheld: Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: 4 Physical Buttons
- Warranty: 3 years
- Dimensions: 5.1 x 2.4 x 0.6 inches
- Weight: 5.4 ounces
Reasons to Buy:
- Lightweight and compact design
- Functions as both a scanner and a secondary car display
- Offers handheld and Bluetooth scanning options
Reasons to Avoid:
- Minimalist interface may be less intuitive for some
- Small 2-inch screen
The Ancel BD310 stands out with its dual functionality. It operates as a standard handheld OBD2 scanner, and when paired with a smartphone via Bluetooth, it transforms into a supplementary dashboard display showing crucial engine parameters. Its compact and lightweight design makes it incredibly convenient to store in your glovebox, ensuring it’s always within reach. While the 2-inch screen is on the smaller side, and the four-button interface might feel slightly basic, these design choices contribute to its portability and ease of use for quick diagnostics. The generous 56-inch cable provides ample reach while working under the hood, and the BD310 capably performs essential functions like I/M readiness tests and displaying performance data including coolant temperature, engine timing, and RPM.
Read our full Ancel BD310 review
Best Companion App OBD-II Scanner
(Image credit: Carly)
5. Carly OBD-II Scanner
Unlock Advanced Features with a Powerful Companion App
Read our expert review of the Carly OBD-II Scanner
Specifications:
- Display: None (App-based)
- Connectivity: Bluetooth
- Handheld: No
- I/M Readiness Test: No
- Live Data Display: Yes
- Keys: None (App-controlled)
- Warranty: Lifetime
- Dimensions: 2.9 x 1.5 x 0.7 inches
- Weight: 0.7 ounces
Reasons to Buy:
- User-friendly and intuitive app interface
- Extensive customization options
- Real-time live data display
- Covers maintenance and repair functions
- Lifetime warranty and updates
Reasons to Avoid:
- Feature availability varies by car make and model
- App subscription required for advanced features can be costly
The Carly OBD Scanner distinguishes itself with the exceptional quality of its companion app. While many Bluetooth OBD2 scanners offer basic apps, Carly provides one of the most feature-rich and user-friendly app experiences we’ve encountered. Beyond basic fault diagnosis and clearing trouble codes, the Carly app offers repair guides, used car inspection tools, and a wealth of customization options. The lifetime warranty is a rare and valuable benefit, adding to its long-term appeal. However, the functionality of the Carly scanner is heavily dependent on your specific car make and model, with brands like VW, BMW, and Ford enjoying the most comprehensive feature support. Also, accessing advanced features beyond basic OBD2 functions requires an ongoing subscription, which can add to the overall cost.
Read our full Carly OBD scanner review
Other OBD-II Scanners We’ve Tested
- Innova CarScan Mobile 1000 (★★★★☆): A highly innovative Bluetooth OBD2 scanner from Innova, known for features like predictive diagnostics, now in a wireless, app-based format. Easy setup and a comprehensive feature set make it a strong Bluetooth-only option. Read the full Innova CarScan Mobile 1000 review
- ThinkCar ThinkDiag TKD01 (★★★★☆): While larger than typical Bluetooth OBD2 adapters, the ThinkDiag TKD01 is built for durability. It offers extensive manufacturer-specific codes and advanced fault code analysis with the ability to fix minor issues automatically. A subscription is required after the first year. Read our full ThinkCar ThinkDiag TKD01 review
- Autel AutoLink AL539 (★★★☆☆): Designed for electrical diagnostics, this OBD2 scanner includes a built-in multimeter for identifying electrical issues like shorts and blown fuses. It also provides a wide range of live data and pre-inspection readiness checks. Read our full Autel AutoLink AL539 review
Frequently Asked Questions About OBD2 Scanners
What is an OBD2 Scanner?
OBD2 scanners are diagnostic tools that mechanics and car owners use to understand a vehicle’s health. Instead of manually inspecting every component, these scanners plug into your car’s OBD port to access information from the onboard computer. At their most basic, OBD2 scanners read and interpret diagnostic trouble codes (DTCs) generated by your car when it detects a problem. More advanced scanners offer real-time system monitoring and even predictive analysis to anticipate potential issues.
What is the OBD-II Port?
The On-Board Diagnostics Version Two (OBD-II) port is a standardized port found in almost all passenger vehicles sold in the US since 1996, Canada since 1998, the EU since 2004, and other regions like Australia and Mexico. This port acts as an interface to your car’s computer, allowing various devices to connect, including OBD2 scanners, insurance telematics devices, and dashcams. If you’re unsure of its location, you can find guides on locating the OBD-II port in North American cars or worldwide OBD-II/EOBD port locations.
What is a DTC (Diagnostic Trouble Code)?
DTC stands for Diagnostic Trouble Code. These are alphanumeric codes generated by your car’s OBD system when it detects a malfunction or issue. OBD2 scanners read these codes, enabling users to diagnose car problems. While many DTCs are standardized across vehicle makes and models, some manufacturers utilize proprietary DTCs specific to their vehicles.
What Do DTCs Actually Mean?
DTCs might seem like random characters, but they follow a logical structure to indicate the type and location of a problem. The first character signifies the affected system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character is a number, indicating whether it’s a generic code (0) or manufacturer-specific code (1). The third character pinpoints the specific subsystem:
- 1: Fuel and air metering
- 2: Injector circuit (fuel and air metering)
- 3: Ignition system or misfire
- 4: Auxiliary emissions
- 5: Vehicle speed controls and idle control
- 6: Computer auxiliary outputs
- 7, 8, 9: Transmission and gearbox
- A, B, C: Hybrid propulsion systems
The fourth and fifth characters specify the exact fault, ranging from 0 to 99. OBD2 scanners translate these codes into understandable descriptions. Advanced scanners provide more detailed information, but online resources like Google can also help decipher DTCs. It’s important to note that not all DTCs indicate critical issues; some may simply be warnings about minor anomalies like slightly elevated engine temperature.
How to Choose the Best OBD2 Scanner for You
An OBD2 scanner is essential for gaining insight into your vehicle’s operation and diagnosing problems. It’s the same technology used by dealerships and repair shops, giving you access to valuable diagnostic information. When choosing an OBD2 scanner, consider these factors:
- Scanner Type: Decide between handheld OBD2 scanners with their own screens or wireless OBD2 scanners that connect to smartphones via Bluetooth.
- Ease of Setup: A user-friendly setup is crucial for quick diagnostics.
- Fault Code Explanation: The best scanners not only display fault codes but also provide clear explanations to help you understand the issue.
- I/M Readiness Check: Ensure the scanner can perform emissions readiness tests to check if your car will pass inspection.
- Accuracy: Reliable and accurate readings are paramount for effective diagnosis.
- Size and Weight: Compact and lightweight scanners are more convenient for storage and on-the-go use.
- Live Data: Live data streaming is valuable for tracking intermittent issues and monitoring engine performance in real-time.
- Graphs and Data Visualization: Visual data representation enhances understanding and analysis.
- Warranty and Updates: Look for scanners with solid warranties and software updates to ensure long-term usability.
Consider whether you prefer the convenience of a wireless scanner with your phone or a dedicated handheld device. Think about longevity and choose a scanner with updates to stay current with automotive technology. For handheld scanners, prioritize screen size and clarity. Rugged designs with rubber bumpers are beneficial for durability. Extra features like multimeters or manufacturer-specific code reading can also be valuable. Ultimately, OBD2 scanners offer professional-level diagnostics at an affordable price, often costing less than an hour of mechanic labor.
How We Test OBD2 Scanners
Our OBD2 scanner testing process involves rigorous real-world evaluation. We use a 2014 Audi A4 Allroad to test each scanner in various scenarios, both in the garage and on the road. Testing steps include:
- VIN Verification: Confirming the scanner accurately reads the vehicle identification number (VIN).
- Connectivity Testing: Evaluating Bluetooth and Wi-Fi connections for wireless scanners, and cable length for handheld units.
- Live Data Monitoring: Monitoring engine and system data while the car is running.
- Fault Code Generation and Reading: Simulating a fault by disconnecting the oil temperature sensor and assessing the scanner’s ability to identify and explain the error code.
- Fault Code Clearing: Verifying the scanner can successfully clear the fault code and turn off the check engine light after the issue is resolved.
- Road Testing: Evaluating the scanner’s ability to display real-time operating data like engine speed, timing, and coolant temperature during driving, and assessing data visualization (numbers, graphs, gauges).
Our testing methodology ensures we thoroughly evaluate each OBD2 scanner’s performance, accuracy, and user-friendliness to provide you with reliable recommendations.
Understanding OBD2 Fault Codes (DTCs)
All OBD2 fault codes consist of five characters: a letter followed by four numbers. The letter prefixes indicate the system affected:
- P: Powertrain (engine, transmission)
- B: Body (interior electrical, airbags)
- C: Chassis (brakes, suspension)
- U: Undefined (network communication)
Numeric sections further define the code. Codes starting with 0 are generic and apply to all vehicles (e.g., P0098 for intake air temperature sensor issue). Codes starting with 1 are manufacturer-specific, indicating more specialized faults (e.g., Ford P1112 for intermittent intake air temperature sensor readings). Understanding this structure helps in interpreting fault codes and diagnosing car problems effectively.
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