The Best Obd2 Scanners are essential tools that provide a direct line into your car’s onboard computer, unlocking a wealth of diagnostic information. Whether you’re facing a mysterious dashboard light or suspect a deeper issue, your car’s computer usually holds the answers. An OBD-II scanner acts as your interpreter, allowing you to understand these complex systems and diagnose problems yourself, saving you potentially expensive trips to the mechanic.
Navigating the world of OBD2 scanners can be overwhelming, especially for beginners. With countless options available, it’s crucial to choose a scanner that meets your needs and budget. Fortunately, we’ve rigorously tested a wide range of OBD-II scanners over the years. Our hands-on experience means we can confidently guide you towards the best choices available today.
From completely wireless options like the feature-rich Topdon TopScan to budget-friendly picks such as the Launch CR529 at just $40, and professional-grade tools like the Topdon Phoenix Lite 2 offering advanced diagnostics, there’s an OBD2 scanner for every need and price point. While the professional capabilities of the Phoenix Lite 2 come at a premium of $799, the investment can be worthwhile for serious enthusiasts or those needing in-depth analysis.
Below are our top recommendations for the best OBD-II scanners currently on the market, each carefully selected based on our extensive testing and evaluation.
Tom Pritchard
Tom is the UK Phones Editor for Tom’s Guide, a leading authority on consumer technology, including mobile devices and automotive tech. As an avid electric vehicle advocate, his expertise extends to the evolving landscape of car technology and diagnostics.
Top OBD2 Scanners at a Glance
Here’s a quick rundown of the best OBD-II scanners you can buy right now. Keep scrolling for detailed reviews and insights into each pick, helping you understand why they stand out.
Topdon TopScan: Best Mobile OBD2 Scanner
1. Topdon TopScan: Best Mobile OBD2 Scanner
The Topdon TopScan excels as the easiest Bluetooth OBD2 scanner to set up, according to our rigorous testing. Despite its compact size, it’s packed with professional-level diagnostic features. Expect comprehensive diagnostics, repair guidance, parts information, and even predictive analysis to foresee potential issues before they escalate.
Dive Deeper into the Topdon TopScan
Launch CR529: Best Budget OBD2 Scanner
2. Launch CR529: Best Budget OBD2 Scanner
The Launch CR529 delivers impressive power in a small package. It offers all the essential OBD-II scanner functions, plus some advanced capabilities typically found on more expensive models. Lifetime support and updates further enhance its value, making it an unbeatable choice for budget-conscious users seeking a reliable car diagnostic tool.
Explore the Value of the Launch CR529
Topdon Phoenix Lite 2: Best Professional OBD2 Scanner
3. Topdon Phoenix Lite 2: Best Professional OBD2 Scanner
The Topdon Phoenix Lite 2, with its robust, tablet-like design, feels like a dedicated gaming device for your car’s computer. However, it’s more than just durable; it’s engineered for both professional mechanics and serious DIYers. If you need a powerful and rugged scanner that can withstand demanding use, this is a top contender.
Discover the Professional Power of the Topdon Phoenix Lite 2
Ancel BD310: Best Dual-Purpose OBD2 Scanner
4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
The Ancel BD310 stands out for its versatility. Beyond its OBD-II scanning capabilities, it can function as an auxiliary dashboard display, showing real-time engine specifications. Combined with its user-friendly design, smartphone compatibility, and affordable price, the BD310 offers exceptional value.
Learn More About the Dual Functionality of the Ancel BD310
Carly OBD-II Scanner: Best OBD2 Scanner with Companion App
5. Carly OBD-II Scanner: Best OBD2 Scanner with Companion App
The Carly OBD-II Scanner’s utility is highly dependent on your car’s make, with VW, BMW, and Ford vehicles benefiting most from its features. However, its standout feature is its exceptional companion app. It’s one of the most comprehensive and user-friendly apps we’ve tested, offering extensive customization and professional-grade diagnostic tests.
Explore the App-Driven Experience of the Carly OBD-II Scanner
Deep Dive: The Best OBD2 Scanners in Detail
Why Trust Tom’s Guide for OBD2 Scanner Reviews? At Tom’s Guide, our commitment is to provide unbiased and thorough reviews to help you make the best purchasing decisions. Our team of expert reviewers invests countless hours in hands-on testing, analyzing product performance, and comparing features to deliver reliable recommendations. Learn more about our rigorous testing methodology.
1. Topdon TopScan: Best Mobile OBD-II Scanner
(Image credit: Topdon)
Topdon TopScan: Unlocking Your Car’s Hidden Potential Wirelessly
Expert Review: Topdon TopScan Review
Key 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:
- Extensive Vehicle Coverage: Exceptional diagnostic capabilities across a wide range of vehicle makes and models.
- Comprehensive Live Data: Real-time monitoring of crucial vehicle parameters for in-depth analysis.
- Performance Indicators: Unique features to assess vehicle performance and efficiency, including horsepower and torque estimation.
- Maintenance Functions: Covers essential maintenance procedures and resets.
Reasons to Consider Alternatives:
- Size of Transmitter: The Bluetooth module might feel slightly bulky for some users.
- Subscription for Full Features: Advanced features may require a subscription after the initial year.
Despite its unassuming appearance, the Topdon TopScan is a powerhouse of automotive diagnostics. This Bluetooth OBD-II module goes far beyond basic error code reading, offering capabilities that rival scanners many times its price. We were particularly impressed by its ability to delve into vehicle performance metrics, estimating horsepower and torque – features uncommon even in professional-grade scanners.
Whether you’re aiming to optimize your car’s performance or simply ensure its roadworthiness, the Topdon TopScan is an invaluable tool to have in your garage. Its ease of use and feature-rich app make it a top pick for anyone seeking a mobile OBD2 scanner.
Read our full Topdon TopScan review for a deeper dive.
2. Launch CR529: Best Cheap OBD-II Scanner
(Image credit: Future)
Launch CR529: Unbeatable Value in an OBD2 Scanner
Expert Review: Launch CR529 Review
Key Specifications:
- Display: 2.8-inch Color Screen
- Connectivity: Cable (Handheld)
- 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:
- Exceptional Affordability: Incredibly priced, making OBD-II diagnostics accessible to everyone.
- Lifetime Updates: Ensures long-term compatibility and access to the latest features without subscription fees.
- Pre-Inspection Report: Simplifies vehicle inspection readiness checks.
Reasons to Consider Alternatives:
- Limited Manufacturer-Specific Codes: May not access specialized codes for all car manufacturers.
- Heavier Build: Might feel a bit weighty compared to more compact scanners.
- Shorter Warranty: 1-year warranty is less than some competitors.
The Launch CR529 redefines value in OBD-II scanners. For its remarkably low price, it delivers a surprising array of diagnostic features. We were genuinely impressed by the level of functionality packed into such an affordable device. While compromises are expected at this price point, the CR529 minimizes them effectively.
It forgoes manufacturer-specific codes and has a slightly heavier feel, but it compensates with live data, instant inspection capabilities, and a detailed view into your car’s systems. Crucially, lifetime updates ensure its continued utility, making it a smart, budget-friendly choice for most car owners. While not tailored for professional mechanics, the CR529 is perfect for everyday users seeking a reliable and cheap OBD2 scanner for home use.
Explore our comprehensive Launch CR529 review for more details.
3. Topdon Phoenix Lite 2: Best Professional OBD-II Scanner
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(Image credit: Future)
Topdon Phoenix Lite 2: Bridging the Gap Between DIY and Professional Diagnostics
Expert Review: Topdon Phoenix Lite 2 Review
Key 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:
- Near-Professional Capabilities: Offers advanced diagnostic features approaching professional-grade scanners.
- Hybrid Wireless Design: Combines handheld convenience with wireless Bluetooth and Wi-Fi connectivity.
- Large Touchscreen: User-friendly 8-inch touchscreen for easy navigation and data viewing.
- Extensive Diagnostic Tests: Performs a wide array of diagnostic tests and provides detailed live data.
- Comprehensive Kit: Includes adapters and a protective hard case for professional use.
Reasons to Consider Alternatives:
- High Price Point: Significantly more expensive than many other OBD-II scanners.
- Bulky and Heavy: Larger and heavier design may be less convenient for some users.
- Subscription After Warranty: Firmware updates require a paid subscription after the initial 2-year period.
The Topdon Phoenix Lite 2 sits at the higher end of the OBD-II scanner spectrum, justifying its price with a wealth of features that cater to both serious DIY enthusiasts and professional mechanics. You get a tool that blurs the lines between amateur and professional car diagnostics.
Its wireless operation, enabled by a Bluetooth module connecting the control pad to the OBD port, provides exceptional freedom of movement around the vehicle. Despite its size, the rugged design and built-in kickstand make it workshop-ready. The Phoenix Lite 2 excels in advanced features like live data graphing and detailed fault analysis, surpassing cheaper scanners. While the post-warranty subscription for updates is a factor, the Phoenix Lite 2 remains a top choice for those seeking a truly professional OBD2 scanner experience.
Read our in-depth Topdon Phoenix 2 Lite review for a complete analysis.
4. Ancel BD310: Best Dual-Purpose OBD-II Scanner
Ancel BD310 (Image credit: Tom’s Guide)
Ancel BD310: An OBD2 Scanner That Doubles as a Dashboard Display
Expert Review: Ancel BD310 Review
Key Specifications:
- Display: 2-inch Color Screen
- Connectivity: Bluetooth, Cable (Handheld)
- 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: Extremely portable and easy to store in a glovebox.
- Dual Functionality: Operates as both a standard scanner and a secondary car display.
- Versatile Connectivity: Supports both handheld and Bluetooth scanning via smartphone.
Reasons to Consider Alternatives:
- Minimalist Interface: Interface might be too simplistic for some users.
- Small Screen Size: 2-inch display can feel cramped for detailed data viewing.
The Ancel BD310 offers a unique blend of functionality, acting as both a traditional handheld OBD-II scanner and a Bluetooth-enabled device that can mirror engine data on your smartphone. It can also function as a supplementary display within your car, showing vital engine stats in real-time.
Its compact and lightweight design makes it exceptionally convenient to keep in your car. While the small screen and minimalist interface might be drawbacks for some, the BD310’s dual-purpose nature and ease of use make it a practical tool. It efficiently performs essential diagnostics, including I/M readiness tests and displaying performance data like coolant temperature and engine speed. This dual-purpose functionality sets the Ancel BD310 apart as a uniquely versatile OBD2 scanner.
Explore our full Ancel BD310 review for a detailed assessment.
5. Carly OBD-II Scanner: Best OBD2 Scanner with Companion App
(Image credit: Carly)
Carly OBD-II Scanner: App-Enhanced Diagnostics, Car Dependent Features
Expert Review: Carly OBD Scanner Review
Key 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 App: Exceptional companion app with an intuitive and easy-to-navigate interface.
- Customization Options: Offers a range of customization settings and features within the app.
- Comprehensive Features: Includes live data, maintenance guides, and repair assistance.
- Used Car Check: Tools to assess the condition of used vehicles.
- Lifetime Warranty: Rare lifetime warranty and software updates provide long-term value.
Reasons to Consider Alternatives:
- Car Model Dependency: Feature availability varies significantly by car make and model.
- Subscription Costs: Full functionality beyond basic OBD features requires an ongoing subscription.
The Carly OBD Scanner distinguishes itself with its outstanding companion app. While many Bluetooth scanners offer basic apps, Carly’s app is exceptionally well-designed and feature-rich. Its capabilities extend beyond basic diagnostics to include repair guidance and used car inspection tools.
The app is user-friendly and packed with customization options, enhancing the overall diagnostic experience. However, the Carly’s effectiveness is heavily dependent on your car’s brand, with optimal performance for VW, BMW, and Ford. While it boasts a lifetime warranty, accessing the full suite of features necessitates a subscription, which can add to the overall cost. For users with compatible vehicles seeking an app-centric OBD2 scanner experience, the Carly is a strong contender.
Read our detailed Carly OBD scanner review for a complete evaluation.
Other OBD-II Scanners We’ve Tested: Honorable Mentions
- Innova CarScan Mobile 1000 (★★★★☆): A highly innovative Bluetooth OBD-II scanner, the Innova CarScan Mobile 1000 brings predictive diagnostics and user-friendly features to a wireless platform. Its simple setup and robust functionality make it a compelling Bluetooth-only option. Read the full Innova CarScan Mobile 1000 review.
- ThinkCar ThinkDiag TKD01 (★★★★☆): While larger than typical Bluetooth OBD-II adapters, the ThinkDiag TKD01 is built for durability. It offers extensive manufacturer-specific error codes and advanced fault-code analysis capable of resolving minor issues without mechanical intervention. A subscription is required after the first year. Read our full ThinkCar ThinkDiag TKD01 review.
- Autel AutoLink AL539 (★★★☆☆): The Autel AutoLink AL539 excels in diagnosing electrical problems, thanks to its integrated multimeter. It can identify issues like damaged wiring, short circuits, 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 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 your car’s computer data. Basic OBD-II scanners read and interpret error codes signaled by your car when it detects a problem. Advanced scanners offer real-time system monitoring and may even predict future issues. These tools empower you to understand your vehicle’s health and address problems proactively.
Understanding 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 US 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. Besides OBD-II scanners, it’s used for devices like insurance trackers and dashcams.
Need help locating it? Here’s a guide to find your car’s OBD-II port in North American vehicles. For worldwide locations, see how to find your OBD-II/EOBD port globally.
Decoding DTCs: Diagnostic Trouble Codes
DTC stands for Diagnostic Trouble Code. These are error codes generated by your car’s OBD system when it detects a malfunction. OBD-II scanners read these codes, enabling users to diagnose vehicle issues. While many DTCs are standardized across vehicle brands, some manufacturers use proprietary codes specific to their vehicles.
Interpreting DTC Meanings
DTCs might seem cryptic at first, appearing as random letter and number combinations. However, they follow a logical structure to indicate the type and location of the problem.
The first letter identifies the affected vehicle system:
- P: Powertrain (engine, transmission)
- B: Body (interior, comfort, safety systems)
- C: Chassis (braking, suspension, steering)
- N: Network (communication systems)
The second character is a number:
- 0: Generic code (standard across manufacturers)
- 1: Manufacturer-specific code
The third character specifies the subsystem involved:
- 1: Fuel and air metering
- 2: Injector circuit (fuel and air metering)
- 3: Ignition system or misfire
- 4: Auxiliary emissions control
- 5: Vehicle speed controls and idle control
- 6: Computer auxiliary outputs
- 7, 8, 9: Transmission and gearbox faults
- A, B, C: Hybrid propulsion system faults
The fourth and fifth characters pinpoint the exact fault within the subsystem, ranging from 0 to 99.
OBD-II scanners translate these codes into understandable descriptions. Advanced models provide more detailed information, but online resources like Google can also help decipher DTCs. It’s worth noting that there are over 5,000 possible DTCs, covering a wide range of potential vehicle issues. Not all DTCs indicate critical problems; some may simply flag minor anomalies like a slightly elevated engine temperature.
Choosing the Right OBD2 Scanner for Your Needs
If you want to understand your car better and diagnose issues proactively, an OBD-II scanner is an invaluable tool. It’s the same technology used by dealerships and repair shops, giving you access to the same diagnostic information. Why not have this capability at your fingertips?
OBD-II scanners come in two main types:
- Handheld OBD-II scanners: Feature an integrated screen and connect via a cable to your car’s OBD port.
- Wireless OBD2 scanners: Plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for display.
High-quality OBD-II scanners are available across different price points, with many under $200 and some budget options under $30. Key factors to consider when choosing the best OBD2 scanner include:
- Ease of Setup: A scanner should be quick and easy to set up for immediate diagnostics.
- Fault Code Explanation: The best scanners not only display fault codes but also provide clear explanations to aid in diagnosis and repair decisions.
- I/M Readiness Check: Essential for verifying emissions system readiness for state inspections.
- Accuracy: Reliable and accurate readings are paramount for effective diagnostics.
- Size and Portability: A compact and lightweight scanner is more likely to be kept in your car for on-the-go diagnostics.
- Live Data Capability: Real-time data monitoring of engine parameters is crucial for tracking down intermittent issues.
- Data Visualization: Graphs and charts enhance data interpretation compared to raw numbers.
- Warranty and Support: A solid warranty and software updates ensure long-term usability.
When selecting an OBD2 scanner, decide whether you prefer a handheld unit with its own display or a wireless scanner that uses your smartphone. Consider long-term value by looking for lifetime warranties or software updates to keep pace with automotive technology advancements.
For handheld scanners, prioritize screen size and clarity for easy readability. Ruggedness is also a factor if durability is a concern. Look for additional features like built-in multimeters, manufacturer-specific code access, or PDF report exporting. Ultimately, the best OBD2 scanner offers a blend of features and value that meets your diagnostic needs without breaking the bank. Considering the cost of professional mechanic labor, even a modestly priced OBD2 scanner can quickly pay for itself.
Our OBD2 Scanner Testing Methodology
To ensure our OBD2 scanner recommendations are reliable and practical, we conduct thorough hands-on testing. Our testing process involves using each scanner with a 2014 Audi A4 Allroad over several weeks under various conditions.
The first step is verifying VIN (Vehicle Identification Number) reporting for each scanner. For wireless models, we test connectivity with devices like Apple iPads, Microsoft Surface tablets, and Samsung Galaxy smartphones via Bluetooth or Wi-Fi. Handheld scanners are tested by direct connection to the OBD-II port, which provides power.
We evaluate cable length for handheld units and wireless range for Bluetooth scanners. With the vehicle running, we monitor engine and system performance using each scanner. To simulate a fault, we disconnect the engine oil temperature sensor.
We then assess each scanner’s ability to accurately identify and describe the fault, clear the error code, and turn off the check engine light. Finally, we road-test each scanner, evaluating its ability to display real-time operating data such as engine speed, timing, and coolant temperature, and how this data is presented (numerically, graphically, or as gauges).
Our testing rigor ensures we recommend only the best OBD2 scanners that provide accurate, reliable, and user-friendly diagnostic capabilities.
Understanding OBD2 Fault Codes: A Deeper Look
Decoding OBD2 fault codes is key to effective car diagnostics. Each code consists of five characters: a letter followed by four numbers. The letter prefixes categorize the system: Powertrain (P), Body (B), Chassis (C), and Undefined (U).
Within the roughly 5,000 available diagnostic fault codes, some are generic (starting with ‘0’) and apply universally across vehicles, like codes for air temperature or throttle position sensors. Others are manufacturer-specific (starting with ‘1’), indicating unique components or more detailed problem analysis for particular car makes.
For example, a generic code P0098 typically points to an issue with the engine’s intake air temperature sensor. In contrast, a manufacturer-specific Ford code P1112 indicates an intermittent issue with the intake air temperature sensor, suggesting sensor replacement. Understanding this coding structure helps in interpreting diagnostic results and taking appropriate action.
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