Deciphering your car’s health doesn’t require a mechanic’s visit anymore. Modern vehicles are equipped with onboard computers that constantly monitor their systems, and an OBD-II scanner is your key to accessing this wealth of information. Whether you’ve noticed a mysterious dashboard light or simply want to understand your car better, a good OBD2 device can empower you to diagnose issues and maintain your vehicle effectively. But with a market flooded with options, What Is A Good Obd2 Device and how do you choose the right one?
We’ve rigorously tested a wide array of OBD-II scanners to bring you the best recommendations. From basic code readers to professional-grade tools, we’ll guide you through the features that matter and help you find the ideal OBD2 device to meet your needs and budget. Keep reading to explore our top picks and learn everything you need to know about selecting a quality OBD-II scanner.
Here are our top selections for the best OBD-II scanners currently available for purchase.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, specializing in mobile technology and automotive tech. He’s a passionate advocate for electric vehicles and a keen observer of the evolving car tech landscape.
The Best OBD-II Scanners at a Glance
Based on our hands-on evaluations, here’s a quick list of the top OBD-II scanners you can buy now. Continue scrolling for detailed reviews and insights into each device, helping you determine what is a good OBD2 device for your specific requirements.
Topdon TopScan Mobile OBD2 Scanner for Easy Wireless Diagnostics1. Topdon TopScan
This Bluetooth scanner stands out for its user-friendly setup and professional-grade features packed into a compact design. It offers comprehensive diagnostics, repair guidance, parts lists, and predictive analysis to anticipate potential problems.
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Launch CR529 OBD-II Scanner: Top Value Pick for Car Diagnostics2. Launch CR529
The Launch CR529 is a small yet potent handheld scanner, providing essential OBD-II functions alongside advanced features typically found in higher-priced models. Its lifetime support and updates make it an exceptional value proposition.
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Topdon Phoenix Lite 2: Robust and Professional OBD2 Diagnostic Tool3. Topdon Phoenix Lite 2
Resembling a rugged tablet, the Topdon Phoenix Lite 2 is built for both professionals and serious DIY enthusiasts. It’s a powerful, durable scanner designed to withstand demanding environments while delivering advanced diagnostic capabilities.
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Ancel BD310: Versatile OBD2 Scanner and Dashboard Display4. Ancel BD310
The Ancel BD310 serves as both a reliable OBD-II scanner and a supplementary dashboard display, offering engine specifications and smartphone connectivity in a sleek, affordable package.
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Carly OBD-II Scanner: App-Driven Diagnostics for Enhanced Vehicle Insights5. Carly OBD-II Scanner
The Carly OBD-II Scanner’s utility is highly dependent on your car make, with brands like VW, BMW, and Ford benefiting the most from its features. It boasts a top-tier companion app with extensive customization and professional-level diagnostic tests.
Deep Dive into the Best OBD-II Scanners: Finding the Right Device for You
Why Trust Tom’s Guide? Our team dedicates considerable time to evaluating and reviewing products to ensure we recommend only the best options for you. Learn more about our rigorous testing methodology.
Best Mobile OBD-II Scanner: Topdon TopScan
(Image credit: Topdon)
1. Topdon TopScan
Unlocking Your Car’s Full Potential with Advanced Mobile Diagnostics
Read our comprehensive review:
Key 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
- Broad automotive diagnostic coverage
- Real-time live data monitoring
- Unique performance indicators
- Comprehensive maintenance features
Reasons to Consider
- Larger transmitter size
- Subscription required for some features after the first year
The Topdon TopScan might appear unassuming, but this compact scanner is surprisingly powerful. More than just a standard Bluetooth OBD-II adapter, it significantly surpasses many competitors in its class. We were impressed by its ability to not only identify faults and conduct I/M Readiness tests, but also to assess performance and efficiency metrics. It can even estimate your car’s horsepower and torque, features often absent in scanners costing ten times as much. Whether you aim to optimize your vehicle’s performance or ensure its roadworthiness, the TopScan is an invaluable tool to have in your garage.
Explore our detailed Topdon TopScan review
Best Budget-Friendly OBD-II Scanner: Launch CR529
(Image credit: Future)
2. Launch CR529
Exceptional Value for Money in OBD-II Diagnostics Under $50
Read our expert analysis:
Key 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
- Highly affordable
- Lifetime free updates
- Convenient pre-inspection report generation
Reasons to Consider
- Limited manufacturer-specific codes
- Slightly heavy handheld feel
- 1-year warranty
In our assessment, the Launch CR529 represents the best value OBD-II scanner currently on the market. Its affordability, priced under $50, is remarkable, especially considering the diagnostic capabilities it offers. We were pleasantly surprised by the extensive features available at such a low price point. While there are trade-offs, such as the absence of manufacturer-specific codes and a somewhat hefty build, it still delivers crucial features like live data, instant inspection reports, and comprehensive insights into your car’s operation. The inclusion of lifetime updates further enhances its long-term value, eliminating the need for subscriptions. Although the CR529 might not satisfy professional mechanics, it’s an excellent choice for most car owners seeking a reliable and budget-friendly diagnostic tool.
Read our full Launch CR529 review
Best Professional-Grade OBD-II Scanner: Topdon Phoenix Lite 2
Topdon Phoenix Lite 2 OBD2 Scanner in Action
(Image credit: Future)
3. Topdon Phoenix Lite 2
Bridging the Gap Between DIY and Professional Automotive Diagnostics
Explore our expert evaluation:
Key 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-level OBD scanner capabilities
- Versatile handheld with Wi-Fi and Bluetooth connectivity
- Large 8-inch touchscreen display
- Extensive array of diagnostic tests and live data
- Includes adapters and protective hard case
Reasons to Consider
- Bulky, heavy, and sometimes cumbersome
- Higher price point
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 is a significant investment, costing more than many other capable OBD-II scanners. However, it delivers exceptional value for its price, offering features that cater to both amateur and professional automotive diagnosticians. A standout feature is its wireless operation, with a Bluetooth receiver connecting to the OBD port and communicating with the control pad, 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 to endure workshop conditions. It also boasts advanced capabilities like live data graphing, detailed fault information, and many more features that are beyond the reach of less expensive scanners. Keep in mind that firmware updates are included for two years, after which a yearly subscription of $495 is necessary.
Read our comprehensive Topdon Phoenix 2 Lite review
Best Dual-Purpose OBD-II Scanner: Ancel BD310
Ancel BD310 OBD2 Scanner and Dashboard Display (Image credit: Tom’s Guide)
4. Ancel BD310
A Practical OBD-II Scanner with Secondary Dashboard Display Functionality
See our detailed review:
Key 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 secondary car display
- Offers handheld and Bluetooth scanning options
Reasons to Consider
- Minimalist interface design
- Small screen size
The Ancel BD310 is a versatile dual-function scanner, working as a standard handheld device or connecting via Bluetooth to smartphones. Notably, it can also transform into a secondary display within your car, showing essential engine data. Its compact and lightweight design makes it exceptionally portable and easy to store in a glovebox. While the 2-inch display is somewhat small and the four-button interface can feel a bit awkward, these factors don’t significantly hinder its diagnostic capabilities. The generous 56-inch cable is ideal for working under the hood, and the BD310 is capable of performing I/M readiness tests and displaying performance data such as coolant temperature, engine timing, and speed.
Read our full Ancel BD310 review.
Best OBD-II Scanner with Companion App: Carly OBD-II Scanner
Carly OBD-II Scanner and Companion App (Image credit: Carly)
5. Carly OBD-II Scanner
An App-Enhanced Scanner with Car-Specific Feature Sets
Explore our expert review:
Key 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 app interface
- Extensive customization options
- Real-time live data display
- Coverage for maintenance and repairs
- Lifetime warranty and updates
Reasons to Consider
- Feature availability varies by car model
- App subscription can be costly
The Carly OBD Scanner provides a wealth of features, particularly through its outstanding companion app. Unlike many Bluetooth scanners with basic apps, Carly offers one of the most sophisticated app experiences we’ve encountered. It not only diagnoses problems and clears fault codes but also provides repair assistance and used car inspection tools to prevent purchasing a problematic vehicle. The lifetime warranty is a significant benefit, offering long-term peace of mind. However, the functionality of the Carly scanner is car-dependent, with optimal performance for brands like VW, BMW, and Ford. Compatibility with your specific car model should be verified before purchase. Additionally, accessing advanced features beyond basic OBD functions requires an ongoing subscription, which can add to the overall cost.
Read our detailed Carly OBD scanner review
Other OBD-II Scanners We’ve Evaluated
Innova CarScan Mobile 1000 review” data-widget-type=”deal” data-render-type=”editorial”>Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a highly innovative Bluetooth OBD-II scanner, inheriting Innova’s impressive features like predictive diagnostics in a wireless, phone-based format. Its exceptionally simple setup process further enhances its appeal as a Bluetooth-only option.
Read the full Innova CarScan Mobile 1000 review
ThinkCar ThinkDiag TKD01 (★★★★☆)
While larger for a Bluetooth OBD-II scanner, the ThinkCar ThinkDiag TKD01’s size contributes to its robustness, making it virtually indestructible. It offers extensive manufacturer-specific error codes and advanced fault-code analysis that can resolve minor issues without mechanic intervention. A $40 subscription is required after the first year.
Read our full ThinkCar ThinkDiag TKD01 review.
Autel AutoLink AL539 (★★★☆☆)
The Autel AutoLink AL539 is designed for diagnosing electrical problems, enhanced by an integrated multimeter. It excels at identifying issues like damaged wiring, shorts, and blown fuses. It also provides a comprehensive range of live data and pre-inspection readiness checks.
Read our full Autel AutoLink AL539 review
Frequently Asked Questions About OBD-II Scanners
What exactly is an OBD-II Scanner?
Mechanics don’t rely on guesswork to diagnose car problems. They use diagnostic scanners plugged into your car’s OBD port to access data from the onboard computer. Basic OBD-II scanners read and interpret error codes generated by your car when it detects an issue. More advanced scanners can monitor systems in real-time and even predict potential future problems. Understanding what is a good OBD2 device starts with knowing its fundamental purpose: to translate your car’s internal language into actionable information.
What is the OBD-II Port?
The On-Board Diagnostics Version Two (OBD-II) port is a standardized interface found in almost all passenger vehicles sold in the U.S. since 1996, Canada since 1998, the EU since 2004, and Australia, Mexico, and New Zealand since 2006. This port serves as the connection point to your car’s onboard computer. Various devices, including OBD-II scanners, insurance telematics devices, and dashcams, can utilize this port. If you’re unsure of its location, you can find guides on locating your car’s OBD-II port in North American vehicles and worldwide OBD-II/EOBD port locations.
What is a DTC?
DTC stands for Diagnostic Trouble Code. These are error codes generated by a vehicle’s OBD system when it detects a malfunction. OBD-II scanners read these codes, allowing users to identify the source of the problem. While many DTCs are standardized across vehicle makes and models, some manufacturers use proprietary DTCs specific to their vehicles.
Understanding DTC Meanings
DTCs might seem cryptic at first, appearing as random combinations of letters and numbers. However, they follow a logical structure that can provide clues about the nature of the error. The first letter indicates the affected system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character, a number, specifies whether it’s a generic code (0) or manufacturer-specific code (1). The third character further pinpoints the subsystem involved:
- 1: Fuel and air metering
- 2: Injector circuit fuel and air metering
- 3: Ignition system or misfire
- 4: Auxiliary emissions
- 5: Vehicle speed control and idle control
- 6: Computer auxiliary outputs
- 7, 8, 9: Transmission and gearbox faults
- A, B, C: Hybrid-specific propulsion faults
The fourth and fifth characters provide further detail about the specific fault, ranging from 0 to 99. OBD-II scanners decode these error codes into understandable descriptions. Advanced models offer more in-depth information. While online resources like Google can help decipher DTCs, remember there are over 5,000 possible codes. Not all DTCs indicate critical issues; some may simply alert you to minor problems like slightly elevated engine temperature.
Choosing the Right OBD-II Scanner for Your Needs
If you’re seeking to understand your car’s operation or diagnose problems, an OBD-II scanner is an invaluable tool. It provides access to the same diagnostic information used by dealerships and repair shops. When considering what is a good OBD2 device for you, understand there are two main types:
Handheld OBD-II scanners come with an integrated screen and cable for direct connection to your car’s OBD port. Wireless OBD2 scanners connect to the OBD port and transmit data via Bluetooth to a smartphone or tablet.
High-quality OBD-II scanners are available across various price points, with many under $200 and some budget options under $30. Key criteria for selecting the best OBD-II scanner include:
- Easy Setup: A scanner should be quick and easy to set up to encourage frequent use for early problem detection.
- Faults and Explanations: Effective scanners not only display fault codes but also provide clear explanations to aid in DIY repairs or informed communication with mechanics.
- I/M Readiness Check: A useful feature for verifying emissions system readiness for state inspections.
- Accuracy: Reliable results are paramount; inaccurate information is worse than no information at all.
- Size and Weight: Portability is important for on-the-go diagnostics; bulky scanners are less convenient.
- Live Data: Real-time monitoring of engine parameters helps in diagnosing intermittent issues.
- Graphs: Visual data representation enhances understanding and comparison of readings.
- Warranty: A good warranty reflects product quality and long-term reliability, ideally lifetime warranties or software updates to maintain relevance with evolving automotive technology.
When considering what is a good OBD2 device, weigh these factors against your specific needs and budget. Decide between handheld or wireless based on your preference for standalone operation or smartphone integration. Consider longevity by prioritizing scanners with lifetime warranties or software updates. For handheld scanners, prioritize screen size and clarity. Ruggedness is a plus for those working in demanding environments. Additional features like electrical multimeters, manufacturer-specific code reading, and PDF export capabilities can also be beneficial. Ultimately, even sophisticated OBD-II scanners are available at reasonable prices, often costing less than an hour of professional mechanic labor, making them a worthwhile investment.
Our OBD-II Scanner Testing Methodology
To rigorously test OBD2 scanners, we used a 2014 Audi A4 Allroad over several weeks in both garage and road conditions. Each scanner was connected to the car’s OBD-II port to verify VIN reporting accuracy. Wireless scanners were paired with an Apple iPad Pro, Microsoft Surface, or Samsung Galaxy S9+ via Bluetooth or Wi-Fi. Handheld scanners were directly powered through the OBD-II port. Cord lengths were measured for handheld units, and wireless ranges assessed for Bluetooth models. With the engine running, we monitored vital systems and simulated a fault by disconnecting the oil temperature sensor. Scanner details, fault code clearing, and check engine light resets were evaluated. Finally, on-road testing assessed live data display of parameters like engine speed, timing, and coolant temperature, noting data presentation formats (numbers, graphs, gauges). This comprehensive testing approach ensures our recommendations for what is a good OBD2 device are based on thorough and practical evaluations.
Understanding OBD-II fault codes is essential. All codes consist of a letter prefix and four numbers: Powertrain (P), Body (B), Chassis (C), or Undefined (U). Of the approximately 5,000 available codes, generic codes (starting with 0) apply across all makes for common issues like air temperature or throttle position. Manufacturer-specific codes (starting with 1) are unique to specific carmakers, indicating specialized hardware or detailed problem analysis. For example, P0098 typically indicates an intake air temperature sensor issue. In contrast, Ford’s P1112 specialty code for the same sensor suggests intermittent readings and the need for replacement. Deciphering these codes, with the help of a good OBD2 device, is key to effective vehicle diagnostics and maintenance.
