Unlocking the secrets hidden within your car’s onboard computer is easier than ever with the best OBD-II scanners. These ingenious devices act as a bridge, connecting you to the wealth of information your car diligently records. Whether you’re facing a perplexing dashboard light or suspect an underlying issue, an OBD-II scanner empowers you to perform your own car diagnostics, potentially saving you the expense of a professional consultation.
Navigating the world of OBD-II scanners can be daunting, especially for newcomers. The market is saturated with options, each boasting different features and capabilities. Having rigorously tested a wide array of OBD-II scanners over the years, we’re here to guide you towards the tools that genuinely deliver value and performance. Below, we present our top recommendations and delve into the workings of OBD-II scanners, demystifying error codes and empowering you to take control of your car’s health.
Our curated list highlights the best OBD-II scanners available today, each rigorously evaluated through hands-on testing. Continue scrolling to explore detailed insights into each pick, understanding their unique strengths and ideal applications.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, bringing expertise across hardware and mobile applications. A passionate advocate for electric vehicles, he closely follows advancements in automotive technology.
The Quick List: Top OBD-II Scanners at a Glance
For those in a hurry, here’s a rapid overview of our top OBD-II scanner recommendations. For deeper dives, simply scroll down to the corresponding sections.
Topdon TopScan mobile OBD-II scanner for advanced diagnostics
1. Topdon TopScan: Best Mobile OBD-II Scanner
Experience seamless wireless connectivity and professional-grade features within a compact design. The Topdon TopScan excels in diagnostics, offering repair guidance, parts identification, and even predictive analysis to anticipate potential issues.
Dive Deeper into Topdon TopScan
Launch CR529 OBD-II scanner offering lifetime updates
2. Launch CR529: Best Budget-Friendly OBD-II Scanner
The Launch CR529 punches above its weight, delivering essential OBD-II scanner functionalities alongside premium features typically found in higher-priced models. Benefit from lifetime support and updates, making it an exceptional value proposition.
Explore the Value of Launch CR529
Topdon Phoenix Lite 2 professional-grade OBD-II scanner with touchscreen interface
3. Topdon Phoenix Lite 2: Best Professional-Level OBD-II Scanner
The Topdon Phoenix Lite 2 merges robust durability with professional diagnostic capabilities. Designed for both seasoned mechanics and car enthusiasts, this scanner offers advanced features in a rugged, user-friendly package, reminiscent of a Nintendo Switch for your car.
Discover Professional Diagnostics with Topdon Phoenix Lite 2
Ancel BD310 dual-purpose OBD-II scanner and car dashboard display
4. Ancel BD310: Best Dual-Purpose OBD-II Scanner
Beyond standard OBD-II scanning, the Ancel BD310 doubles as 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
Carly OBD-II scanner with companion app for vehicle customization and diagnostics
5. Carly OBD-II Scanner: Best OBD-II Scanner with Companion App
The Carly OBD-II Scanner’s utility is amplified by its exceptional companion app, offering extensive customization options and professional-level tests, particularly for VW, BMW, and Ford vehicles.
Explore the Carly OBD-II Scanner App Experience
What Defines the Best OBD-II Scanners?
Why Trust Tom’s Guide? At Tom’s Guide, our commitment is to provide you with unbiased and thorough reviews. Our team of writers and editors dedicates countless hours to rigorously analyze and evaluate products, services, and apps, ensuring we recommend only the best options for you. Learn more about our rigorous testing methodology.
1. Topdon TopScan: Best Mobile OBD-II Scanner
(Image credit: Topdon)
Topdon TopScan Review: Unleash Your Car’s Hidden Potential
Read our expert review
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:
- Transmitter size and weight
- Subscription required for some features after the first year
The Topdon TopScan defies expectations with its unassuming appearance. This compact Bluetooth OBD-II module is far more than just a basic scanner; it’s a powerhouse of diagnostic capabilities, surpassing many competitors in its class. Beyond standard fault detection and I/M Readiness tests, the TopScan ventures into performance and efficiency analysis, even estimating horsepower and torque – features often absent in scanners costing ten times more. Whether you aim to optimize your vehicle’s performance or ensure its roadworthiness, the Topdon TopScan is an invaluable addition to any toolkit.
Read our comprehensive Topdon TopScan review
2. Launch CR529: Best Cheap OBD-II Scanner
(Image credit: Future)
Launch CR529 Review: Unbeatable Value Under $50
Read our expert review
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 Avoid:
- Lacks manufacturer-specific specialty codes
- Heavier build
- 1-year warranty
The Launch CR529 stands out as the best value OBD-II scanner on the market, not solely due to its incredibly low price point, but because of the extensive diagnostic features it packs for the cost. The level of functionality offered at this price is truly remarkable. While compromises exist, such as the absence of manufacturer-specific codes and a slightly heavier feel, the CR529 compensates with live data streaming, instant inspection reports, and surprisingly detailed insights into your car’s operation. Moreover, lifetime updates ensure long-term usability without subscription fees. While perhaps not ideal for professional mechanics, the Launch CR529 is an excellent choice for everyday car owners seeking reliable diagnostics on a budget.
Read our in-depth Launch CR529 review
3. Topdon Phoenix Lite 2: Best Professional-Level OBD-II Scanner
Topdon Phoenix Lite 2 OBD-II scanner in a workshop environment
(Image credit: Future)
Topdon Phoenix Lite 2 Review: Bridging the Gap Between Amateur and Professional Diagnostics
Read our expert review
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 features
- Hybrid handheld design with Wi-Fi and Bluetooth connectivity
- Large 8-inch touchscreen display
- Extensive array of diagnostic tests and live data parameters
- Includes adapters and protective hard case
Reasons to Avoid:
- Bulky and heavy design
- Higher price point
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 commands a higher price than many OBD-II scanners, but it justifies the investment by delivering a feature set that blurs the lines between amateur and professional diagnostic tools. Ideal for both DIY enthusiasts and professional mechanics, this scanner offers a wealth of capabilities. Its wireless operation, facilitated by a Bluetooth receiver connecting the control pad to the OBD port, allows for exceptional mobility around the vehicle. While the scanner itself is substantial in size and weight, it incorporates a kickstand and robust construction designed to withstand demanding workshop environments. Advanced features like live data graphing, comprehensive fault information, and a suite of sophisticated diagnostic tests elevate it beyond basic scanners. Note that firmware updates are included for two years, with an optional annual subscription of $495 thereafter.
Explore our full Topdon Phoenix 2 Lite review
4. Ancel BD310: Best Dual-Purpose OBD-II Scanner
Ancel BD310 displaying engine parameters (Image credit: Tom’s Guide)
Ancel BD310 Review: A Versatile OBD-II Scanner with Added Functionality
Read our expert review
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 for portability
- Functions as both a scanner and 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 traditional handheld device and also connecting to smartphones via Bluetooth. Its unique capability to transform into a secondary dashboard display, showing key engine metrics within the car cabin, adds significant value. The BD310’s 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 may feel slightly unconventional, these aspects don’t hinder its diagnostic performance. The 56-inch cable provides ample reach, and the BD310 effectively performs functions like I/M readiness tests and displays crucial performance data, including coolant temperature, engine timing, and RPM.
Read our detailed Ancel BD310 review.
5. Carly OBD-II Scanner: Best OBD-II Scanner with Companion App
(Image credit: Carly)
Carly OBD-II Scanner Review: App-Driven Diagnostics and Customization
Read our expert review
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
- Coverage for maintenance and repairs
- Lifetime warranty and updates
Reasons to Avoid:
- Feature availability varies by car model
- App subscription costs for full functionality
The Carly OBD Scanner excels with its outstanding companion app, setting it apart from many Bluetooth scanners with rudimentary app experiences. Carly’s app is remarkably well-designed and feature-rich, offering not only fault code reading and diagnostics but also repair assistance, used car checks, and extensive customization capabilities. A lifetime warranty adds further appeal. However, feature compatibility varies across car models, so verifying your vehicle’s compatibility prior to purchase is crucial. While the app’s basic OBD functions are free, accessing advanced features requires an ongoing subscription, which can become costly depending on usage.
Explore our full Carly OBD scanner review
Other OBD-II Scanners We’ve Tested:
- Innova CarScan Mobile 1000 (★★★★☆): A highly innovative Bluetooth OBD-II scanner that inherits Innova’s impressive features, including predictive diagnostics, in a wireless, phone-based format. Its incredibly simple setup process makes it a compelling Bluetooth-only option.
Read the full Innova CarScan Mobile 1000 review
- ThinkCar ThinkDiag TKD01 (★★★★☆): While larger than typical Bluetooth OBD-II scanners, the TKD01’s robust build ensures durability. It offers a wide range of manufacturer-specific error codes and extended fault codes capable of resolving minor issues without mechanic intervention. A $40 annual subscription is required after the first year.
Read our full ThinkCar ThinkDiag TKD01 review.
- Autel AutoLink AL539 (★★★☆☆): This OBD-II scanner is specifically engineered for electrical diagnostics, incorporating a built-in multimeter to identify issues like burnt cables, 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 OBD-II Scanners
What exactly is an OBD-II Scanner?
Mechanics rely on OBD-II scanners to efficiently diagnose car problems. Instead of manual disassembly, these scanners plug into your car’s OBD port, accessing the onboard computer’s data. Basic OBD-II scanners read and interpret error codes flagged by your car’s system when an issue arises. Advanced models offer real-time system monitoring and even predictive analysis of potential future problems.
Understanding the OBD-II Port
The On-Board Diagnostics Version Two (OBD-II) port has become a standard feature in passenger vehicles across major markets: since 1996 in the US, 1998 in Canada, 2004 in the EU, and 2006 in Australia, Mexico, and New Zealand. This standardized port serves as the interface point to your car’s onboard computer. Beyond OBD-II scanners, it accommodates various devices, including insurance telematics devices and modern dash cams. If you need help locating your OBD-II port, resources are available to guide you in finding your car’s OBD-II port in North American vehicles and worldwide OBD-II/EOBD port locations.
Decoding DTCs: Diagnostic Trouble Codes
DTC stands for Diagnostic Trouble Code. These error codes are generated by your car’s OBD system upon detecting an issue. OBD-II scanners read these codes, enabling users to understand the nature of the problem. While many DTCs are standardized across vehicle makes and models, some manufacturers utilize proprietary DTCs specific to their vehicles.
Interpreting DTC Meanings
DTCs may initially appear as cryptic combinations of letters and numbers. However, a logical structure underlies them, providing clues about the detected errors. The first letter indicates the affected vehicle system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character, a number, specifies whether the code is generic (0) or manufacturer-specific (1). The third character further pinpoints the specific system involved:
- 1: Fuel and air metering
- 2: Injector circuit specific fuel and air metering
- 3: Ignition system or misfire
- 4: Auxiliary emissions control
- 5: Vehicle speed controls and idle control systems
- 6: Computer auxiliary outputs
- 7, 8, 9: Transmission and gearbox faults
- A, B, C: Hybrid-specific propulsion faults
The fourth and fifth characters refine the fault identification, ranging from 0 to 99. OBD-II scanners translate these codes into understandable descriptions. Advanced scanners offer more detailed information. Online resources like Google can also assist in DTC interpretation. It’s important to note that not all DTCs signify critical issues; some may indicate minor concerns like slightly elevated engine temperature. Over 5,000 potential DTCs exist.
Choosing the Right OBD-II Scanner for Your Needs
For insightful information about your car’s performance or underlying problems, an OBD-II scanner is an invaluable tool. It provides access to the same diagnostic data used by car dealerships and repair shops. OBD-II scanners come in two main types:
- Handheld OBD-II scanners: Feature an integrated screen and connect to the OBD port via a cable.
- Wireless OBD-II scanners: Plug into the OBD port and transmit data wirelessly via Bluetooth to a smartphone or tablet.
High-performing OBD-II scanners are available across various price points, with many costing under $200 and some budget options under $30. Key factors to consider when selecting an OBD-II scanner include:
- Ease of Setup: A straightforward setup process ensures you’ll readily use the scanner for timely diagnostics.
- Fault Code Explanation: The best scanners not only identify fault codes but also provide clear explanations, enabling DIY repairs or informed communication with mechanics.
- I/M Readiness Check: A valuable feature for emissions testing, allowing you to verify your vehicle’s readiness for inspection.
- Accuracy: Reliable and accurate results are paramount for effective diagnostics.
- Size and Weight: Portability and ease of handling are important, especially for roadside use.
- Live Data: Real-time data streaming of engine parameters aids in identifying intermittent issues.
- Graphs: Visual data representation through graphs enhances data analysis and comparison.
- Warranty: Opt for scanners with robust warranties, ideally lifetime warranties, ensuring long-term reliability.
Choosing between handheld and wireless scanners depends on personal preference. Consider longevity by prioritizing scanners with lifetime warranties or software updates to stay current with automotive technology advancements. For handheld scanners, prioritize screen size and clarity for easy readability. Rugged designs with shock-absorbing bumpers are beneficial for durability. Additional features like built-in multimeters, manufacturer-specific code reading, and PDF report export capabilities can further enhance functionality. Ultimately, sophisticated OBD-II scanners are available at surprisingly affordable prices, often less than the cost of an hour of professional mechanic labor, making them a worthwhile investment.
Our OBD-II Scanner Testing Methodology
To rigorously evaluate OBD-II scanners, we employed a 2014 Audi A4 Allroad over several weeks in diverse driving conditions. Each scanner was connected to the vehicle’s OBD-II port, verifying VIN reporting accuracy. Wireless scanners were paired with devices like Apple iPads, Microsoft Surface tablets, and Samsung Galaxy S9+ phones via Bluetooth or Wi-Fi. Handheld scanners were directly powered through the OBD-II port. Cord lengths of handheld scanners and wireless ranges were measured. Engine and vital systems were monitored during vehicle operation. To simulate a fault, the engine oil temperature sensor was disconnected. Scanner diagnostics, fault code details, and error clearing capabilities were assessed. Road tests were conducted to evaluate live data display, including engine speed, timing, and coolant temperature, noting data presentation formats (numerical, graphs, gauges). We analyzed the scanners’ ability to interpret and display fault codes accurately, considering the standardized DTC format and variations in generic versus manufacturer-specific codes.
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