The best OBD2 scanners are essential tools for modern car owners, offering a direct line to your vehicle’s onboard computer. Whether you’re facing a mysterious dashboard light or suspect engine trouble, these scanners decode the hidden language of your car, allowing you to diagnose issues without immediate professional help. However, the market is flooded with options, and choosing the right one can be daunting. Having rigorously tested a wide array of OBD2 scanners over the years, we’ve pinpointed the top performers worth your investment. Keep reading to discover our expert recommendations and understand how these scanners work, including deciphering those cryptic error codes.
Among our top selections, the Topdon TopScan stands out as a remarkably effective wireless option for in-depth diagnostics. For budget-conscious users, the Launch CR529, priced around $40, delivers exceptional value. If you require professional-grade capabilities, the Topdon Phoenix Lite 2 offers an experience akin to a professional diagnosis, though it comes with a higher price tag of $799.
Here’s a quick rundown of the best OBD2 scanners available in 2023, based on our hands-on evaluations. Continue scrolling for detailed insights into each scanner and what makes them excel.
1. Topdon TopScan: Best Mobile OBD2 Scanner
The Topdon TopScan is our top pick for mobile OBD2 scanners because of its effortless Bluetooth setup and a suite of professional-grade features packed into a compact design. This scanner provides comprehensive diagnostics, repair guidance, parts lists, and even predictive analysis to foresee potential problems.
Dive Deeper into Topdon TopScan
2. Launch CR529: Best Cheap OBD2 Scanner
The Launch CR529 is a small yet mighty OBD2 scanner that delivers essential functionalities and some advanced features rarely found in similarly priced competitors. Its lifetime support and updates offer incredible long-term value.
Explore the Value of Launch CR529
3. Topdon Phoenix Lite 2: Best Rugged, Pro-Level OBD2 Scanner
Resembling a robust Nintendo Switch, the Topdon Phoenix Lite 2 features a durable, horizontal design built for both professionals and DIY enthusiasts. It’s a powerful, rugged scanner designed to withstand demanding environments.
Discover Professional Diagnostics with Topdon Phoenix Lite 2
4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
The Ancel BD310 functions effectively as both an OBD2 scanner and an auxiliary dashboard display, providing real-time engine specifications. Its sleek design, smartphone compatibility, and affordable price enhance its appeal.
Learn More About Ancel BD310’s Dual Functionality
5. Carly OBD-II Scanner: Best OBD2 Scanner with Companion App
The Carly OBD-II Scanner’s utility is heavily dependent on your car make, with optimal performance for VW, BMW, and Ford vehicles. It boasts one of the most user-friendly companion apps, offering extensive customization and professional-level tests.
Explore Carly OBD-II Scanner and its App
Deep Dive into the Best OBD2 Scanners of 2023
Why Trust Tom’s Guide? At Tom’s Guide, our team of experts dedicates countless hours to evaluating and reviewing products to bring you unbiased and reliable recommendations. Learn more about our rigorous testing methodologies.
1. Topdon TopScan: Best Mobile OBD2 Scanner
(Image credit: Topdon)
Key Features:
- Display/Size: None (App-based)
- Bluetooth/Handheld: Yes/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 automotive diagnostic coverage
- Real-time live data monitoring
- Unique performance indicators
- Comprehensive maintenance item coverage
Reasons to Consider Other Options:
- Larger and heavier transmitter
- Advanced features may require a subscription after the first year
The Topdon TopScan may appear unassuming, but this compact scanner is packed with features that go beyond typical Bluetooth OBD2 modules. It not only transmits data to a user-friendly phone app, but it also surpasses many competitors in its diagnostic capabilities. Beyond reading fault codes and running I/M readiness tests, the TopScan excels in performance and efficiency checks, even estimating horsepower and torque – features often found in scanners ten times its price. Whether you aim to optimize your car’s performance or ensure its roadworthiness, the Topdon TopScan is an invaluable addition to any toolkit.
Read our full Topdon TopScan review
2. Launch CR529: Best Cheap OBD2 Scanner
(Image credit: Future)
Key Features:
- Display/Size: Color/2.8-inches
- Bluetooth/Handheld: No/Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: 8
- Warranty: 1 year
- Dimensions: 6.5 x 3.8 x 1.2 inches
- Weight: 11 ounces
Reasons to Buy:
- Highly affordable
- Lifetime free updates
- Convenient pre-inspection report feature
Reasons to Consider Other Options:
- Lacks manufacturer-specific codes
- Feels somewhat heavy
- Limited 1-year warranty
The Launch CR529 is arguably the best value OBD2 scanner on the market. Its remarkably low price doesn’t compromise its diagnostic features. For its cost, the CR529 delivers an impressive array of functionalities. While it does have limitations, such as the absence of manufacturer-specific codes and a slightly hefty feel, it still offers crucial features like live data, instant inspection reports, and detailed insights into your vehicle’s operation. The inclusion of lifetime updates further enhances its value, ensuring long-term usability without subscription fees. Though perhaps not ideal for professional mechanics needing specialized codes, the Launch CR529 is an excellent choice for most car owners looking for a reliable and budget-friendly diagnostic tool.
Read our full Launch CR529 review
3. Topdon Phoenix Lite 2: Best Pro-Level OBD2 Scanner
(Image credit: Future)
Key Features:
- Display/Size: Color/8-inch Touchscreen
- Bluetooth/Handheld: Yes/Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: Touchscreen
- Warranty: 2 years
- Dimensions: 10.2 x 7.2 x 1.7 inches
- Weight: 2.6 pounds
Reasons to Buy:
- Near-professional grade OBD scanner
- Hybrid handheld with Wi-Fi and Bluetooth
- Large 8-inch touchscreen display
- Extensive range of diagnostic tests and live data
- Includes adapters and a hard case for storage
Reasons to Consider Other Options:
- Bulky, heavy, and can be cumbersome
- High price point
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 is a significant investment, priced higher than many other capable OBD2 scanners, but it delivers exceptional value for the money. It bridges the gap between amateur and professional diagnostic tools, making it suitable for both experienced mechanics and serious car enthusiasts. Its wireless operation, with a Bluetooth-connected control pad, offers unparalleled mobility around the vehicle. While the scanner itself is substantial in size and weight, it features a kickstand and rugged construction designed to withstand workshop conditions. Advanced features like live data graphing, detailed fault information, and numerous sophisticated diagnostic functions set it apart from cheaper scanners. However, be aware of the post-purchase costs; firmware updates are only free for two years, after which a yearly subscription is required.
Read our full Topdon Phoenix Lite 2 review
4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
(Image credit: Tom’s Guide)
Key Features:
- Display/Size: Color/2 inches
- Bluetooth/Handheld: Yes/Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: 4
- 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 both handheld and Bluetooth scanning
Reasons to Consider Other Options:
- Minimalist interface design
- Small screen size
The Ancel BD310 is a versatile dual-purpose scanner that operates as a standard handheld device and connects to smartphones via Bluetooth. Notably, it can also function as a secondary display within your car, showing essential engine metrics in real-time. Its compact and lightweight design makes it exceptionally portable and easy to store in a glovebox. While the 2-inch screen is somewhat small and the four-key interface might feel slightly awkward initially, these aspects don’t hinder its diagnostic capabilities. The included 56-inch cable is ideal for convenient use while working under the hood. The BD310 effectively performs functions like I/M readiness tests and provides performance data, including coolant temperature, engine timing, and speed.
Read our full Ancel BD310 review
5. Carly OBD-II Scanner: Best OBD2 Scanner with Companion App
(Image credit: Carly)
Key Features:
- Display/Size: None (App-based)
- Bluetooth/Handheld: Yes/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 app interface
- Extensive customization options
- Live data display within the app
- Coverage for maintenance and repairs
- Lifetime warranty and updates
Reasons to Consider Other Options:
- Feature availability varies by car model
- App subscriptions can become costly for full functionality
The Carly OBD Scanner stands out for its feature-rich offerings, particularly the exceptional quality of its companion app. Unlike many basic Bluetooth scanners with rudimentary apps, Carly provides one of the most sophisticated app experiences available. It not only diagnoses issues and clears fault codes but also provides repair assistance and used car check features to prevent buying a problematic vehicle. The lifetime warranty is a significant advantage. However, the functionality of the Carly scanner is car-dependent; not all features are compatible with every make and model. Prospective buyers should verify compatibility with their specific vehicle. Additionally, while the app is outstanding, accessing advanced features beyond basic OBD functions requires an ongoing subscription, which can add to the overall cost.
Read our full Carly OBD scanner review
Other OBD2 Scanners We’ve Evaluated
Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a highly innovative Bluetooth OBD2 scanner, inheriting Innova’s renowned features like predictive diagnostics in a completely wireless format controlled via your smartphone. Its remarkably simple setup process further enhances its appeal as a Bluetooth-only option.
Read the full Innova CarScan Mobile 1000 review
ThinkCar ThinkDiag TKD01 (★★★★☆)
Despite being larger than typical Bluetooth OBD2 adapters, the ThinkCar ThinkDiag TKD01 is exceptionally robust. It offers extensive manufacturer-specific error codes and advanced fault-code interpretations that can resolve minor issues without mechanic intervention. However, a subscription fee applies after the first year.
Read our full ThinkCar ThinkDiag TKD01 review
Autel AutoLink AL539 (★★★☆☆)
The Autel AutoLink AL539 OBD2 scanner is specifically designed for electrical diagnostics, featuring a built-in multimeter to detect issues like burnt wires, shorts, and blown fuses. It also provides comprehensive 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 use to identify car problems by connecting to a vehicle’s OBD port and accessing data from its onboard computer. These scanners, even basic models, can read and interpret error codes generated by your car when it detects a problem. More advanced scanners can monitor vehicle systems in real-time and even predict potential future issues.
What is the OBD2 Port?
The On-Board Diagnostics Version Two (OBD2) port is a standardized port found in almost all passenger vehicles sold in the U.S. since 1996, Canada since 1998, the EU since 2004, and other regions including Australia, Mexico, and New Zealand since 2006. This port serves as the interface for accessing your car’s computer. Besides OBD2 scanners, it’s also used by devices like insurance black boxes and dash cams.
If you’re unsure of its location, here’s how to find the OBD2 port in North American vehicles. For worldwide locations, consult this guide to find your OBD2/EOBD port globally.
What is a DTC?
DTC stands for Diagnostic Trouble Code. It’s an error code generated by a vehicle’s OBD system when it detects a malfunction. OBD2 scanners read these codes, enabling users to diagnose car problems. Many DTCs are standardized across vehicle makes and models, but some manufacturers use proprietary DTCs specific to their vehicles.
Understanding DTC Meanings
DTCs might seem like random characters, but they follow a structured format that indicates the type and location of the problem. The first letter designates the affected system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character, a number, indicates whether the code is generic (0) or manufacturer-specific (1).
The third character specifies the subsystem involved:
- 1: Fuel and air metering
- 2: Injector circuit issues
- 3: Ignition system or misfires
- 4: Auxiliary emissions
- 5: Speed control and idle control systems
- 6: Computer auxiliary outputs
- 7, 8, 9: Transmission and gearbox faults
- A, B, C: Hybrid propulsion faults
The fourth and fifth characters pinpoint the exact fault within the system, ranging from 0 to 99. OBD2 scanners translate these codes into understandable descriptions. However, more advanced scanners provide more detailed information. While scanners help, further research on platforms like Google may be needed, as there are over 5,000 potential DTCs. Not all DTCs indicate critical issues; some may simply warn of minor anomalies like slightly elevated engine temperature.
Choosing the Best OBD2 Scanner for Your Needs
For insights into your vehicle’s health and potential problems, an OBD2 scanner is invaluable. It provides access to the same diagnostic information used by dealerships and repair shops. Why not have this capability yourself?
OBD2 scanners come in two primary types:
- Handheld OBD2 scanners: These have their own display screen and connect via a cable to the OBD port.
- Wireless OBD2 scanners: These plug into the OBD port and connect wirelessly via Bluetooth to a smartphone or tablet for display.
Regardless of the type, many high-quality OBD2 scanners are available for under $200, with some priced below $30. Key considerations when choosing an OBD2 scanner include:
- Easy Setup: A scanner should be quick and easy to set up for prompt diagnostics.
- Fault Code Explanation: The best scanners not only display fault codes but also explain their meanings, aiding in DIY repairs or informed discussions with mechanics.
- I/M Readiness Check: A useful feature for verifying emissions system readiness for state inspections.
- Accuracy: Accurate readings are crucial for reliable diagnoses.
- Size and Weight: Portability ensures the scanner is readily available for use in your car, not just in the toolbox.
- Live Data: Monitoring real-time engine parameters helps diagnose intermittent issues.
- Graphs: Visual data representation enhances understanding and comparison of readings.
- Warranty: Opt for scanners with robust warranties, ideally lifetime or extended coverage, and software updates for longevity.
When selecting an OBD2 scanner, decide between a handheld unit with an integrated screen or a wireless model that uses your phone or tablet. Consider long-term value by looking for lifetime warranties or software updates. For handheld scanners, prioritize screen size and clarity, aiming for icon-based interfaces for ease of use. Rugged models with shock-absorbing bumpers are beneficial for durability. Extra features like electrical multimeters, manufacturer-specific code reading, and PDF export capabilities can also be advantageous. Ultimately, sophisticated OBD2 scanners are available at reasonable prices, often under $100, making them a cost-effective alternative to professional diagnostic services.
Our OBD2 Scanner Testing Methodology
To evaluate the best OBD2 scanners, we conducted hands-on testing using a 2014 Audi A4 Allroad over several weeks in various driving conditions. Each scanner was connected to the vehicle’s OBD2 port to verify VIN recognition. Wireless scanners were paired with devices like an Apple iPad Pro, Microsoft Surface, or Samsung Galaxy S9+ via Bluetooth or Wi-Fi. Handheld scanners were tested by direct OBD2 port connection, which also provides power.
We assessed cable length for handheld models and wireless range for Bluetooth scanners. With the engine running, we monitored engine and system parameters. To test diagnostic accuracy, we deliberately disconnected the engine oil temperature sensor. We then evaluated the scanner’s ability to identify and describe the fault, clear the error code, and turn off the check engine light. Finally, we road-tested each scanner to monitor live data displays, noting if data was presented numerically, graphically, or via gauges.
Understanding OBD2 fault codes is crucial. All codes consist of four numbers and a leading letter indicating the system: Powertrain (P), Body (B), Chassis (C), or Undefined (U). Generic codes, starting with 0, apply across all makes, while manufacturer-specific codes, starting with 1, are unique to specific carmakers and often indicate more detailed or specialized issues. For example, a P0098 code typically signals an issue with the intake air temperature sensor, whereas a Ford-specific P1112 code for the same sensor suggests intermittent readings requiring sensor replacement.
More Resources From Tom’s Guide
Explore more car tech reviews and recommendations from Tom’s Guide.
