The Best Obd2 Scanner is an essential tool for any car owner wanting to understand their vehicle’s health. Connecting directly to your car’s onboard computer, an OBD-II scanner unlocks a wealth of information about its performance and potential problems. Whether you’ve noticed a mysterious dashboard light or suspect an issue under the hood, these scanners empower you to diagnose car troubles like a professional, saving you time and money on unnecessary mechanic visits.
Navigating the world of OBD-II scanners can be overwhelming, especially for beginners. The market is flooded with options, each promising to be the best. Having rigorously tested numerous OBD-II scanners over the years, we’ve pinpointed the top performers that are genuinely worth your investment. Keep reading to discover our expert recommendations and gain a deeper understanding of how OBD-II scanners function and interpret those cryptic error codes.
Among our top selections, the Topdon TopScan stands out as a remarkably user-friendly wireless option, packing impressive diagnostic capabilities into a compact design. For budget-conscious users, the Launch CR529, priced around $40, offers exceptional value without compromising essential features. However, if you seek a professional-grade diagnostic experience, the Topdon Phoenix Lite 2 delivers advanced functionalities akin to those used by professional mechanics, albeit at a higher price point of $799.
Below are our curated picks for the best OBD-II scanners available today, catering to various needs and budgets.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, covering the latest in mobile technology and automotive tech. A passionate advocate for electric vehicles, he brings extensive knowledge of car technology to his reviews.
Top OBD-II Scanners: Quick Picks
Based on our rigorous hands-on testing, here’s a quick list of the best OBD-II scanners you can buy right now. Scroll down for detailed reviews and insights into each product’s strengths.
[](best mobile scanner)
1. Topdon TopScan: Best Mobile OBD-II Scanner
Effortless Bluetooth setup and professional-grade features in a compact design. Offers comprehensive diagnostics, repair guidance, parts information, and predictive analysis for potential issues.
Explore the Topdon TopScan
[](best cheap scanner)
2. Launch CR529: Best Budget OBD-II Scanner
Compact and powerful, delivering essential OBD-II scanner functions with premium features not typically found in its price range. Includes lifetime support and updates, offering incredible value.
Discover the Launch CR529
[](best rugged scanner)
3. Topdon Phoenix Lite 2: Best Professional-Grade OBD-II Scanner
Robust and designed for both professionals and enthusiasts, featuring a rugged tablet-style interface. Delivers advanced diagnostic capabilities for in-depth car analysis.
Learn about the Topdon Phoenix Lite 2
[](best dual-purpose scanner)
4. Ancel BD310: Best Dual-Purpose OBD-II Scanner
Functions as a standard OBD-II scanner and can also display real-time engine data on your dashboard via smartphone connection. Combines ease of use with versatile functionality.
See the Ancel BD310 in detail
[](best scanner with a companion app)
5. Carly OBD-II Scanner: Best OBD-II Scanner with Companion App
Offers extensive customization and professional-level diagnostics, particularly for VW, BMW, and Ford vehicles, enhanced by an exceptional companion app.
Explore the Carly OBD-II Scanner
Deep Dive into the Best OBD-II Scanners
Why Trust Tom’s Guide? At Tom’s Guide, our product reviews are built on rigorous testing and analysis. Our experts dedicate countless hours to evaluating products to provide you with dependable recommendations. Learn more about our testing methodology.
1. Topdon TopScan: Best Mobile OBD-II Scanner
(Image credit: Topdon)
Perfect for: In-depth car diagnostics and performance monitoring on the go.
Expert Review: The Topdon TopScan redefines the capabilities of a compact OBD2 scanner. It’s more than just a basic Bluetooth OBD-II module; it’s a powerhouse of diagnostic features that rivals scanners many times its price. I was particularly impressed by its ability to go beyond simple fault finding, delving into performance and efficiency metrics.
Key Features:
- Extensive Diagnostic Coverage: Offers comprehensive diagnostics, comparable to professional-grade tools.
- Live Data Streaming: Provides real-time data on your vehicle’s performance.
- Performance Indicators: Uniquely estimates horsepower and torque, allowing for performance analysis.
- Maintenance Monitoring: Covers essential maintenance aspects, ensuring vehicle longevity.
Pros:
- Exceptional diagnostic capabilities for its size.
- User-friendly mobile app interface.
- Valuable performance analysis features.
- Comprehensive maintenance functions.
Cons:
- The Bluetooth transmitter module is somewhat bulky.
- Advanced features may require a subscription after the first year.
The Topdon TopScan truly surprised me with its extensive capabilities packed into such a small form factor. It’s an excellent choice for anyone looking to deeply understand their car’s performance and maintain it effectively. Whether you’re aiming to optimize your car’s performance or ensure its reliability, the TopScan is a valuable addition to your toolkit.
Read our full Topdon TopScan review
2. Launch CR529: Best Cheap OBD-II Scanner
(Image credit: Future)
Perfect for: Car owners seeking essential OBD-II functionality at an unbeatable price.
Expert Review: The Launch CR529 redefines “value” in OBD-II scanners. For a remarkably low price, this scanner delivers diagnostic features that punch well above its weight class. I was genuinely surprised by the level of functionality packed into a device at this price point.
Key Features:
- Affordable Price: Extremely budget-friendly, making it accessible to all car owners.
- Lifetime Updates: Ensures the scanner remains current with the latest vehicle technology.
- Pre-Inspection Report: Simplifies vehicle inspection readiness checks.
- Comprehensive Diagnostics: Offers a thorough insight into your car’s systems for the price.
Pros:
- Unbelievably inexpensive for its feature set.
- Free lifetime software updates.
- User-friendly interface and easy pre-inspection reporting.
Cons:
- Does not support manufacturer-specific diagnostic codes.
- Feels a bit heavy for its size.
- Limited 1-year warranty.
While the Launch CR529 has a few limitations, particularly for users needing manufacturer-specific diagnostics, it offers incredible value for the average car owner. The lifetime updates are a significant bonus, ensuring long-term usability without subscription fees. If you need a reliable OBD-II scanner without breaking the bank, the CR529 is an outstanding choice.
Read our full Launch CR529 review
3. Topdon Phoenix Lite 2: Best Professional-Level OBD-II Scanner
(Image credit: Future)
Perfect for: Serious DIYers and professional mechanics demanding advanced diagnostic capabilities.
Expert Review: The Topdon Phoenix Lite 2 sits at the intersection of amateur accessibility and professional-grade functionality. While a significant investment, it delivers an impressive suite of features that justify the cost for users who need in-depth diagnostics. Its wireless operation and robust design enhance usability in any garage or workshop setting.
Key Features:
- Professional-Grade Diagnostics: Offers advanced diagnostic tests and live data analysis, rivaling professional tools.
- Wireless Operation: Bluetooth connectivity provides freedom of movement around the vehicle during diagnostics.
- Large Touchscreen Display: Features an 8-inch color touchscreen for easy navigation and data visualization.
- Comprehensive Kit: Includes adapters and a hard case for protection and versatility.
Pros:
- Near-professional level diagnostic capabilities.
- Convenient wireless operation with Wi-Fi and Bluetooth.
- Large, intuitive 8-inch touchscreen display.
- Extensive diagnostic tests and real-time data.
- Comes with necessary adapters and a protective hard case.
Cons:
- Higher price point compared to other OBD-II scanners.
- Bulky and somewhat heavy, which can be cumbersome.
- Subscription required for updates after the initial two years.
The Topdon Phoenix Lite 2 bridges the gap between consumer and professional OBD-II scanners. Its extensive feature set, wireless convenience, and rugged design make it an excellent tool for those serious about car diagnostics. While the price and size might be drawbacks for casual users, professionals and dedicated enthusiasts will find it a worthwhile investment.
Read our full Topdon Phoenix Lite 2 review
4. Ancel BD310: Best Dual-Purpose OBD-II Scanner
Ancel BD310 (Image credit: Tom’s Guide)
Perfect for: Users wanting an OBD-II scanner that doubles as a real-time dashboard display.
Expert Review: The Ancel BD310 stands out with its dual functionality. It operates as a standard handheld OBD-II scanner but also cleverly transforms into a secondary display for your car, showing essential engine parameters via a Bluetooth smartphone connection. This unique capability makes it a versatile tool for both diagnostics and performance monitoring.
Key Features:
- Dual-Purpose Functionality: Works as a handheld scanner and a Bluetooth-connected dashboard display.
- Compact and Lightweight: Easy to store in a glovebox for on-the-go diagnostics.
- Bluetooth Connectivity: Connects to smartphones for extended features and data display.
- Comprehensive Data Display: Shows key engine metrics like coolant temperature, engine speed, and timing.
Pros:
- Lightweight and compact design for portability.
- Dual functionality as a scanner and secondary display.
- Versatile handheld and Bluetooth scanning options.
Cons:
- Minimalist interface may not appeal to all users.
- Small 2-inch screen can be limiting for detailed data viewing.
The Ancel BD310 offers a unique blend of diagnostic capability and real-time monitoring in a compact package. Its ability to function as a secondary dashboard display is particularly useful for tracking engine performance data while driving. While the small screen and minimalist interface are minor drawbacks, its versatility and portability make it a great choice for everyday car owners.
Read our full Ancel BD310 review
5. Carly OBD-II Scanner: Best OBD-II Scanner with Companion App
(Image credit: Carly)
Perfect for: Tech-savvy users who value a feature-rich companion app and customization options, especially for European car brands.
Expert Review: The Carly OBD-II Scanner distinguishes itself with its exceptional companion app. Unlike many Bluetooth scanners with basic app interfaces, Carly delivers a polished, feature-rich app that significantly enhances the diagnostic experience. The value of Carly is particularly pronounced for owners of VW, BMW, and Ford vehicles, which benefit from the app’s extensive customization and advanced diagnostic features.
Key Features:
- Exceptional Companion App: One of the most user-friendly and feature-rich OBD-II scanner apps available.
- Extensive Customization: Offers numerous customization options and professional-level tests.
- Repair Assistance: Provides repair guides to help users address diagnosed issues.
- Used Car Check: Includes tools to assess the condition of used vehicles.
- Lifetime Warranty: Offers a rare lifetime warranty, adding significant value.
Pros:
- Intuitive and easy-to-use app interface.
- Extensive customization options for compatible vehicles.
- Valuable live data display and repair assistance.
- Rare lifetime warranty and software updates.
Cons:
- Feature availability varies significantly by car model.
- Subscription required for advanced features beyond basic OBD-II functions, which can be costly.
The Carly OBD-II Scanner’s strength lies in its companion app, which elevates the user experience far beyond typical Bluetooth scanners. While its comprehensive features aren’t universally applicable to all car brands, owners of compatible vehicles, particularly European makes, will find it exceptionally powerful. The subscription model for advanced features should be considered in the overall cost evaluation.
Read our full Carly OBD scanner review
Other OBD-II Scanners We’ve Tested
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Innova CarScan Mobile 1000 (★★★★☆): An innovative Bluetooth OBD-II scanner with predictive diagnostics and a simple setup. Read the full Innova CarScan Mobile 1000 review
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ThinkCar ThinkDiag TKD01 (★★★★☆): A robust Bluetooth OBD-II scanner with manufacturer-specific codes and fault-clearing capabilities. Read our full ThinkCar ThinkDiag TKD01 review
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Autel AutoLink AL539 (★★★☆☆): Designed for electrical diagnostics with a built-in multimeter and comprehensive live data. Read our full Autel AutoLink AL539 review
Frequently Asked Questions About OBD-II Scanners
What is an OBD-II Scanner?
An OBD-II scanner is a diagnostic tool that mechanics and car owners use to access information from a vehicle’s onboard computer system. Instead of manually inspecting every component, mechanics plug these scanners into the OBD port of a car to quickly identify problems.
At their most basic, OBD-II scanners read and interpret Diagnostic Trouble Codes (DTCs) generated by your car when it detects an issue. More advanced scanners offer real-time system monitoring and can even predict potential future problems. Using the best OBD2 scanner helps you understand your car’s health and address issues proactively.
What is the OBD-II Port?
The On-Board Diagnostics Version II (OBD-II) port is a standardized interface found in nearly all passenger vehicles sold in the United States since 1996, Canada since 1998, the European Union since 2004, and other regions including Australia, Mexico, and New Zealand from 2006 onwards.
This port serves as the connection point to your car’s onboard computer. Beyond OBD-II scanners, it’s also used for various devices like insurance telematics boxes and dashcams.
If you’re unsure of your OBD-II port’s location, you can find guides on locating the OBD-II port in North American cars 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 diagnose car problems. While many DTCs are standardized across vehicle makes and models, some manufacturers use proprietary DTCs specific to their vehicles. Understanding DTCs is key to effective car maintenance and repair using an OBD2 scanner.
What Do DTCs Actually Mean?
DTCs might appear as a jumble of letters and numbers initially. However, they follow a logical structure that reveals the nature and location of the problem.
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First Letter: Indicates the affected vehicle system:
- P – Powertrain (engine, transmission)
- B – Body (interior and exterior body components)
- C – Chassis (braking, suspension, steering)
- N – Network (communication systems)
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Second Character: Indicates code type:
- 0 – Generic code (standard across all manufacturers)
- 1 – Manufacturer-specific code (unique to a particular car maker)
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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 control and idle control
- 6 – Computer output circuit
- 7, 8, 9 – Transmission and gearbox faults
- A, B, C – Hybrid propulsion system faults
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Fourth and Fifth Characters: Provide a more granular fault description, ranging from 00 to 99.
OBD-II scanners decode these DTCs, often providing descriptions of the issue. Advanced scanners offer more detailed information, but online resources like Google can also help decipher DTC meanings. There are thousands of potential DTCs, but not all signify critical problems. Some may indicate minor issues like a slightly elevated engine temperature. Using a best OBD2 scanner simplifies interpreting these codes and understanding your car’s needs.
Choosing the Best OBD-II Scanner for Your Needs
When seeking insights into your car’s operation or diagnosing issues, an OBD-II scanner is invaluable. It’s the same technology used by dealerships and repair shops, providing you with direct access to your vehicle’s diagnostic information. Choosing the best OBD2 scanner depends on your specific needs and preferences.
OBD-II scanners come in two primary types:
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Handheld OBD-II Scanners: These units have an integrated screen and connect to your car’s OBD port via a cable.
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Wireless OBD-II Scanners: These plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for display and operation.
Both types offer high-performance options under $200, with some basic models available for under $30. Key factors to consider when selecting the best OBD2 scanner include:
- Ease of Setup: A scanner should be easy to set up and use quickly for timely diagnostics.
- Fault Code Explanation: The best scanners not only display fault codes but also provide clear explanations, aiding in DIY repairs or informed discussions with mechanics.
- I/M Readiness Check: A valuable feature for quickly assessing emissions system readiness for state inspections.
- Accuracy: Reliable and accurate results are paramount for effective diagnostics.
- Size and Weight: A compact and lightweight scanner is more convenient for in-car storage and on-the-go use.
- Live Data Display: Real-time data monitoring helps in diagnosing intermittent issues and understanding system performance.
- Data Graphing: Visual data representation through graphs enhances analysis, especially for comparative assessments.
- Warranty: Opt for scanners with robust warranties, ideally lifetime warranties, to ensure long-term value.
Deciding between handheld and wireless models, considering desired features like screen size, ruggedness, and extra functionalities such as multimeters or manufacturer-specific code access, will guide you to the best OBD2 scanner for your needs. With prices comparable to an hour of labor at a repair shop, investing in a quality OBD-II scanner is a cost-effective way to take control of your car maintenance.
How We Test OBD-II Scanners
To evaluate OBD-II scanners, I used my 2014 Audi A4 Allroad over several weeks in various driving conditions. The testing process involved:
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VIN Verification: Ensuring each scanner correctly identified the vehicle identification number (VIN).
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Connectivity Testing: For wireless scanners, testing Bluetooth and Wi-Fi connections with devices like Apple iPad Pro, Microsoft Surface, and Samsung Galaxy S9+. Handheld scanners were tested for cable length and ease of connection.
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Live Data Monitoring: Monitoring engine performance and vital systems while the car was running.
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Fault Code Generation and Reading: Disconnecting the engine oil temperature sensor to trigger a fault code, then using each scanner to read and interpret the code.
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Fault Code Clearing: After reconnecting the sensor, testing each scanner’s ability to clear the check engine light and erase the stored error code.
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Road Testing: Assessing the scanner’s ability to display real-time operating data like engine speed, timing, and coolant temperature during actual driving, noting data presentation formats (numerical, graphs, gauges).
This comprehensive testing methodology ensured a thorough evaluation of each OBD-II scanner’s performance, accuracy, and user-friendliness, leading to our recommendations for the best OBD2 scanner options available.
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