The best OBD2 scanners are essential tools that can unlock your car’s hidden data by connecting to its onboard computer. Whether you’re dealing with a perplexing dashboard light or suspect a mechanical issue, your car’s computer likely holds the answers. An OBD2 scanner acts as an intermediary, empowering you to diagnose problems yourself, potentially saving you money on professional mechanic fees.
However, the market is flooded with OBD2 scanners of varying quality, which can be overwhelming, especially for beginners. We understand this firsthand. Over years of testing various OBD2 scanners, we’ve gained the expertise to discern which models truly stand out. Keep reading to discover our top recommendations and a comprehensive guide on how OBD2 scanners function and deciphering those cryptic error codes.
Among our top picks, the Topdon TopScan emerges as a standout wireless option, remarkably effective for pinpointing car troubles. For budget-conscious users, the Launch CR529, priced around $40, offers excellent value. If you’re seeking a more professional-grade experience and are prepared to invest, the Topdon Phoenix Lite 2 delivers advanced diagnostic capabilities, albeit at a higher price point of $799.
Below are our curated selections for the Top Obd2 Scanners currently available.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, with expertise spanning from cutting-edge hardware to essential mobile applications. He is also a passionate advocate for electric vehicles.
Top OBD2 Scanner Quick List
Based on our rigorous hands-on testing, here are the best OBD2 scanners you can buy right now. Continue scrolling for detailed reviews of each product and insights into their standout features.
1. Topdon TopScan: Best Mobile OBD2 Scanner
This Bluetooth scanner impressed us with its effortless setup and professional-grade features packed into a compact design. Expect comprehensive diagnostics, repair guidance, parts lists, and even predictive analysis to anticipate potential issues.
Dive Deeper into Topdon TopScan
2. Launch CR529: Best Budget OBD2 Scanner
The Launch CR529 is a small yet potent OBD2 scanner that provides essential functionalities and some premium features rarely found in its price range. Benefit from lifetime support and updates, making it an exceptionally valuable tool.
Explore Launch CR529 Features
3. Topdon Phoenix Lite 2: Best Rugged OBD2 Scanner
Resembling a Nintendo Switch in robustness, the Topdon Phoenix Lite 2 is designed for both professionals and DIY enthusiasts. It’s a powerful, durable scanner built to withstand demanding environments.
Learn More About Topdon Phoenix Lite 2
4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
Beyond standard OBD2 scanning, the Ancel BD310 can function as an auxiliary dashboard display, showing real-time engine metrics. It combines sleek design, smartphone compatibility, and affordability.
Discover Ancel BD310 Capabilities
5. Carly OBD2 Scanner: Best OBD2 Scanner with Companion App
The Carly scanner’s utility is car-dependent, with optimal features for VW, BMW, and Ford. It boasts one of the most feature-rich companion apps, offering extensive customization and professional-level diagnostics.
Explore Carly OBD2 Scanner App
In-Depth Reviews of Top OBD2 Scanners
Best Mobile OBD2 Scanner: Topdon TopScan
(Image credit: Topdon)
1. Topdon TopScan
Perfect for Extensive Car Diagnostics
Read our expert review of Topdon TopScan
Specifications:
- Display/Size: None
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: None
- Warranty: 2 years
- Size: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Exceptional automotive diagnostic coverage
- Real-time live data monitoring
- Unique performance indicators
- Comprehensive maintenance item coverage
Reasons to Avoid:
- Bulky transmitter
- Subscription required for some features after the first year
The Topdon TopScan may appear unassuming, but this compact scanner is packed with features that go beyond appearances. It’s not just a standard Bluetooth OBD2 module relaying basic car data to your smartphone app. We were impressed to find it significantly surpasses the capabilities of other scanners in its class.
Beyond basic fault detection and I/M Readiness tests, the TopScan excels in performance and efficiency analysis. It can even estimate your vehicle’s horsepower and torque – features rarely found in OBD2 scanners, especially at this price point. Many scanners costing ten times as much lack these advanced capabilities. Whether you aim to optimize your car’s performance or ensure its roadworthiness, the Topdon TopScan is an invaluable tool for your garage.
Read our detailed Topdon TopScan review
Best Budget OBD2 Scanner: Launch CR529
(Image credit: Future)
2. Launch CR529
Top OBD2 Scanner Under $50
Read our expert review of Launch CR529
Specifications:
- Display/Size: Color/ 2.8-inches
- Bluetooth/Handheld: No/Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: 8
- Warranty: 1 year
- Size: 6.5 x 3.8 x 1.2 inches
- Weight: 11 ounces
Reasons to Buy:
- Affordable price
- Lifetime free updates
- Easy pre-inspection report generation
Reasons to Avoid:
- Limited manufacturer-specific codes
- Feels somewhat heavy
- 1-year warranty
The Launch CR529 is arguably the best value OBD2 scanner on the market. Its affordable price of around $38 is astounding, especially considering the range of diagnostic features it offers. We were genuinely surprised by the level of functionality available at such a low cost.
Of course, some compromises come with a scanner this budget-friendly. It lacks manufacturer-specific codes and has a slightly heavier feel. However, it still provides live data, a quick inspection feature, and a surprisingly detailed view into your car’s systems. Furthermore, lifetime updates ensure its long-term usability without subscription fees.
While the CR529 might not satisfy professional mechanics, it’s an excellent choice for everyday car owners and DIYers seeking a reliable and affordable OBD2 scanner.
Read our comprehensive Launch CR529 review
Best Professional-Level OBD2 Scanner: Topdon Phoenix Lite 2
(Image credit: Future)
3. Topdon Phoenix Lite 2
Bridging the Gap Between DIY and Professional Diagnostics
Read our expert review of Topdon Phoenix Lite 2
Specifications:
- Display/Size: Color/8-inch
- Bluetooth/Handheld: Yes/Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: Touchscreen
- Warranty: 2 years
- Size: 10.2 x 7.2 x 1.7 inches
- Weight: 2.6 pounds
Reasons to Buy:
- Professional-grade OBD scanner capabilities
- Versatile handheld with Wi-Fi and Bluetooth connectivity
- Large 8-inch touchscreen display
- Extensive suite of diagnostic tests and live data
- Includes adapters and a protective hard case
Reasons to Avoid:
- Large, heavy, and can be unwieldy
- High price point
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 is a significant investment, costing more than many other capable OBD2 scanners. However, it justifies its price by delivering an exceptional array of features suitable for both amateur and professional mechanics.
A key highlight is its wireless operation. The control pad connects via Bluetooth to a receiver in your car’s OBD port, providing unparalleled freedom of movement around the vehicle. While the scanner itself is substantial in size and weight, it features a kickstand and robust construction designed for workshop environments.
It offers advanced features like live data graphing, detailed fault information, and functionalities that are beyond the reach of most budget scanners. Note that firmware updates are included for two years, after which an annual subscription of $495 is required.
Read our in-depth Topdon Phoenix 2 Lite review
Best Dual-Purpose OBD2 Scanner: Ancel BD310
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
A Versatile OBD2 Scanner with Added Functionality
Read our expert review of Ancel BD310
Specifications:
- Display/Size: Color/2 inches
- Bluetooth/Handheld: Yes/Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: 4
- Warranty: 3 years
- Size: 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
- Small screen size
The Ancel BD310 distinguishes itself as a dual-purpose scanner, functioning as a standard handheld device or connecting to smartphones via Bluetooth. Even more uniquely, it can transform into a secondary display within your car, showing crucial engine data in real-time.
Its compact and lightweight design makes the BD310 incredibly portable; it easily fits in a glovebox. While the 2-inch display feels a bit small and the four-button interface slightly cumbersome, these aspects don’t significantly hinder its diagnostic capabilities.
The generous 56-inch cable is ideal for convenient hood-side work, and the BD310 efficiently performs tasks like I/M readiness tests and provides performance metrics such as coolant temperature, engine timing, and RPM.
Read our full Ancel BD310 review.
Best OBD2 Scanner with Companion App: Carly OBD2 Scanner
(Image credit: Carly)
5. Carly OBD2 Scanner
Car-Specific Features with an Excellent App
Read our expert review of Carly OBD2 Scanner
Specifications:
- Display/Size: No
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: No
- Live Data Display: Yes
- Number of Keys: None
- Warranty: Lifetime
- Size: 2.9 x 1.5 x 0.7 inches
- Weight: 0.7 ounces
Reasons to Buy:
- User-friendly interface
- Extensive customization options
- Live data display
- Covers maintenance and repairs
- Lifetime warranty and updates
Reasons to Avoid:
- Feature availability varies by car model
- App subscriptions can become costly
The Carly OBD2 Scanner offers a wealth of features, with its companion app being a standout element. Unlike many basic Bluetooth scanner apps, Carly provides one of the most sophisticated app experiences we’ve encountered.
It not only diagnoses issues and clears fault codes but also offers repair assistance and tools to assess used cars for potential problems. The inclusion of a lifetime warranty is a significant advantage.
However, the functionality of Carly varies depending on your car model. Full feature sets are best utilized with VW, BMW, and Ford vehicles. While the app is exceptional, accessing advanced features beyond basic OBD functionalities requires an ongoing subscription, which can add up over time.
Read our complete Carly OBD scanner review
Other OBD2 Scanners We Tested
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Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a highly innovative Bluetooth OBD2 scanner, inheriting Innova’s impressive predictive diagnostic features in a wireless format accessible through your smartphone. Its incredibly simple setup process further enhances its appeal as a Bluetooth-only option.
Read the full Innova CarScan Mobile 1000 review
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ThinkCar ThinkDiag TKD01 (★★★★☆)
Despite its larger size compared to typical Bluetooth OBD2 adapters, the ThinkDiag TKD01 boasts exceptional durability. It offers a wide range of manufacturer-specific error codes and extended fault codes that can resolve minor issues without needing a mechanic. A $40 subscription is required after the first year.
Read our full ThinkCar ThinkDiag TKD01 review.
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Autel AutoLink AL539 (★★★☆☆)
The Autel AutoLink AL539 OBD2 scanner is specifically designed for diagnosing electrical problems, enhanced by its integrated multimeter. It effectively identifies issues like damaged wiring, short circuits, and blown fuses. It also provides extensive 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?
Mechanics use diagnostic scanners plugged into your car’s OBD port to understand car problems, not manual disassembly. OBD2 scanners read data from your car’s computer. Basic scanners identify error codes, while advanced ones monitor systems in real-time and predict future issues.
What is the OBD2 Port?
The On-Board Diagnostics Version Two (OBD2) port is standard in:
- US cars since 1996
- Canadian cars since 1998
- EU cars since 2004
- Australian, Mexican, and New Zealand cars since 2006
This port interfaces with the car’s computer and accepts OBD2 scanners, insurance black boxes, and dash cams. If you’re unsure of its location, find OBD2 port locations for North American cars or worldwide OBD2/EOBD port locations.
What is a DTC?
DTC stands for Diagnostic Trouble Code, an error code generated by a car’s OBD system when it detects a problem. OBD2 scanners read these codes to help users diagnose car issues. Standardized DTCs are common across vehicles, but some manufacturers use unique DTCs.
What do DTCs Actually Mean?
DTCs might seem cryptic, but they follow a logical structure that indicates the type and location of the problem.
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First Letter: System affected: Powertrain (P), Body (B), Chassis (C), Network (N).
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Second Character: Code type: Generic (0) or Manufacturer-Specific (1).
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Third Character: Subsystem:
- 1: Fuel and air metering
- 2: Injector circuit fuel and air metering
- 3: Ignition system or misfire
- 4: Auxiliary emissions
- 5: Vehicle speed and idle control
- 6: Computer auxiliary outputs
- 7, 8, 9: Transmission and gearbox
- A, B, C: Hybrid propulsion
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Fourth and Fifth Characters: Specific fault (00-99).
OBD2 scanners translate these codes into understandable descriptions. Advanced models offer more detail. Further research on Google may be needed as there are over 5,000 possible DTCs. Not all DTCs are critical; some indicate minor issues like slightly elevated engine temperature.
Choosing the Right OBD2 Scanner for You
An OBD2 scanner is the best tool for understanding your car’s health and diagnosing issues. It’s the same method dealerships and repair shops use. You can access the same insights with your own scanner.
OBD2 scanners come in two main types:
- Handheld OBD2 scanners: Feature an integrated screen and cable.
- Wireless OBD2 scanners: Connect to smartphones or tablets via Bluetooth.
High-quality OBD2 scanners are available for under $200, and some even cost less than $30. Key considerations when choosing an OBD2 scanner include:
- Easy Setup: Quick setup is crucial for timely diagnostics.
- Faults and Explanations: Clear fault codes with understandable explanations are essential for DIY repairs or mechanic communication.
- I/M Readiness Check: Ensures your car will pass emissions inspections.
- Accuracy: Reliable results are paramount for effective diagnostics.
- Size and Weight: Portability for on-the-go diagnostics.
- Live Data: Real-time monitoring for tracking intermittent issues.
- Graphs: Visual data representation for better analysis.
- Warranty: Long-term coverage, ideally lifetime warranties, ensure lasting value.
When selecting an OBD2 scanner, decide between handheld and wireless models. Consider features like lifetime updates, screen size (for handhelds), ruggedness, and extras like multimeters or PDF export. Priced affordably, OBD2 scanners are a valuable investment, often costing less than an hour of mechanic labor.
How We Test OBD2 Scanners
To evaluate OBD2 scanners, we used a 2014 Audi A4 Allroad over several weeks in various driving conditions. We verified VIN reporting, Bluetooth/Wi-Fi connectivity (for wireless scanners with an iPad Pro, Microsoft Surface, or Samsung Galaxy S9+), and cable length on handheld models.
With the engine running, we monitored engine performance and then simulated a fault by disconnecting the oil temperature sensor. We assessed the scanner’s fault reporting, troubleshooting, and error code clearing capabilities.
Road tests evaluated live data display (engine speed, timing, coolant temperature) in numerical, graphical, and gauge formats.
We deciphered fault codes, noting the letter prefix (Powertrain (P), Body (B), Chassis (C), Undefined (U)) and numeric sections (generic codes starting with 0, manufacturer-specific codes starting with 1). For example, P0098 (generic intake air temperature sensor issue) versus Ford’s P1112 (manufacturer-specific intermittent intake air temperature sensor fault).
