The best OBD2 scanners are essential tools for any car owner who wants to understand what’s going on under the hood. These devices connect to your car’s onboard computer, providing access to a wealth of information about its health and performance. Whether you’re dealing with a mysterious dashboard light or suspect a mechanical issue, an OBD2 scanner empowers you to diagnose problems yourself, potentially saving you money on expensive mechanic visits.
However, the world of OBD2 scanners can be overwhelming, especially for beginners. With countless models on the market, each boasting different features and capabilities, choosing the right one can feel like a daunting task. Having tested numerous OBD2 scanners over the years, we’ve sorted through the noise to identify the top performers.
Currently, the Innova 6100P stands out as our top pick, offering a comprehensive suite of features, including predictive diagnostics and repair information. For those who prefer a wireless experience, the Topdon TopScan provides exceptional mobile connectivity and diagnostic power. And for budget-conscious users, the Launch CR529 delivers impressive functionality at an affordable price.
Here’s a curated list of the best OBD2 scanners available today, catering to various needs and budgets.
Tom Pritchard
Tom is the Tech Expert at TechCarUSA, with years of experience reviewing automotive gadgets and tools. He is passionate about empowering car owners with the knowledge and tools to maintain their vehicles effectively.
The Top OBD2 Scanners at a Glance
Here are our recommended OBD2 scanners, categorized for quick reference. Continue scrolling for detailed reviews of each product and insights into choosing the right scanner for your needs.
Innova 6100P: Best OBD2 Scanner Overall
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Innova 6100P: Best Overall OBD2 Scanner
This scanner offers a professional-level experience, providing detailed diagnostics, repair guidance, and predictive maintenance features.
Topdon TopScan: Best Mobile OBD2 Scanner
2. Topdon TopScan: Best Mobile OBD2 Scanner
A compact, wireless scanner with Bluetooth connectivity and professional-grade diagnostic features, including performance analysis and maintenance tracking.
Launch CR529: Best Budget OBD2 Scanner
3. Launch CR529: Best Budget OBD2 Scanner
A powerful and affordable handheld scanner offering essential OBD2 functions and lifetime updates, ideal for users on a budget.
Topdon Phoenix Lite 2: Best Rugged OBD2 Scanner
4. Topdon Phoenix Lite 2: Best Rugged OBD2 Scanner
A robust, professional-grade scanner with a large touchscreen, wireless connectivity, and advanced diagnostic capabilities, built to withstand tough conditions.
Discover the Topdon Phoenix Lite 2
Ancel BD310: Best Dual-Purpose OBD2 Scanner
5. Ancel BD310: Best Dual-Purpose OBD2 Scanner
A versatile scanner that functions as both a handheld OBD2 reader and a supplementary dashboard display, offering Bluetooth connectivity and essential diagnostic features.
Carly OBD-II Scanner: Best OBD2 Scanner with Companion App
6. Carly OBD-II Scanner: Best OBD2 Scanner with Companion App
A user-friendly Bluetooth scanner with an exceptional companion app, providing extensive customization options and professional-level diagnostics, particularly for European car brands.
Explore the Carly OBD-II Scanner
What Makes These OBD2 Scanners the Best?
At TechCarUSA, our reviews are built on rigorous testing and analysis. We spend countless hours evaluating products to ensure we recommend only the best to our readers. Learn more about our testing methodology.
Best OBD2 Scanner Overall
Innova 6100P OBD2 Scanner Menu
1. Innova 6100P
The Innova 6100P is our pick for the best overall OBD2 scanner because it provides a near-professional diagnostic experience for DIYers and car enthusiasts.
Read our Expert Review of Innova 6100P
Key Features:
- Display: 2.8-inch Color Screen
- Connectivity: Handheld, App-Based (Bluetooth)
- I/M Readiness Test: Yes
- Live Data: Yes
- Warranty: 1 Year
Pros:
- User-friendly and portable design.
- Resets battery and oil lights.
- Offers both handheld and app-based diagnostics.
- Provides repair instructions and parts information.
- Predictive maintenance features.
Cons:
- Text-based interface may lack visual appeal for some users.
- Buttons require firm presses.
During our hands-on testing, the Innova 6100P impressed us with its ability to simplify complex diagnostics. Even users with limited automotive knowledge will appreciate how easily it facilitates problem identification and resolution. While the initial setup is slightly more involved than some competitors, the scanner quickly connects to the OBD port and provides immediate access to vehicle data.
The hybrid functionality, allowing users to choose between the handheld scanner and the Innova companion app, is a significant advantage. The app’s predictive maintenance feature, which forecasts potential component failures, is particularly valuable, enabling proactive maintenance and preventing unexpected breakdowns. For a price around $120, the Innova 6100P delivers exceptional value, offering live data, fault code readings, pre-inspection checks, and a generous cable length.
For a deeper dive, read our comprehensive Innova 6100P review.
Best Mobile OBD2 Scanner
Topdon TopScan Bluetooth OBD2 Scanner
2. Topdon TopScan
The Topdon TopScan earns the title of best mobile OBD2 scanner due to its compact size and surprisingly comprehensive feature set, accessed through a user-friendly mobile app.
Read our Expert Review of Topdon TopScan
Key Features:
- Display: App-Based (Smartphone Required)
- Connectivity: Bluetooth
- I/M Readiness Test: Yes
- Live Data: Yes
- Warranty: 2 Years
Pros:
- Extensive diagnostic coverage.
- Provides live data streams.
- Includes performance indicators (horsepower, torque estimation).
- Covers maintenance functions.
Cons:
- Larger transmitter size compared to some Bluetooth adapters.
- Subscription required for some advanced features after the first year.
Don’t let its unassuming appearance fool you; the Topdon TopScan is a powerhouse in a small package. This Bluetooth OBD2 module goes beyond basic fault code reading, offering features typically found in higher-priced professional scanners. We were impressed by its ability to not only diagnose issues but also assess vehicle performance and efficiency. The TopScan can even estimate horsepower and torque figures, features rarely seen in scanners in this price range.
Whether you’re a performance enthusiast or simply want to keep your car in optimal condition, the Topdon TopScan is a valuable addition to your toolkit. It offers a remarkable depth of diagnostic and performance analysis capabilities, rivaling scanners costing significantly more.
Read our in-depth Topdon TopScan review for more details.
Best Budget OBD2 Scanner
Launch CR529 Handheld OBD2 Scanner
3. Launch CR529
The Launch CR529 is our top pick for the best budget OBD2 scanner, delivering exceptional value and a surprising range of features for its low price point.
Read our Expert Review of Launch CR529
Key Features:
- Display: 2.8-inch Color Screen
- Connectivity: Handheld
- I/M Readiness Test: Yes
- Live Data: Yes
- Warranty: 1 Year
Pros:
- Extremely affordable.
- Lifetime free updates.
- Provides easy pre-inspection reports.
Cons:
- Lacks manufacturer-specific advanced codes.
- Slightly heavier than some handheld scanners.
- 1-year warranty is shorter than some competitors.
The Launch CR529 redefines “budget-friendly” in the OBD2 scanner market. For its incredibly low price (around $40), it offers a feature set that rivals scanners costing significantly more. We were particularly impressed with the level of diagnostic information and functionality available at this price point.
While compromises are expected at this price, such as the absence of manufacturer-specific codes and a slightly heavier build, the CR529 still provides essential features like live data, instant inspection reports, and a surprisingly detailed view of your vehicle’s systems. The inclusion of lifetime updates ensures long-term usability without recurring subscription fees. For users seeking a reliable and affordable OBD2 scanner for basic diagnostics, the Launch CR529 is an unbeatable value proposition.
For more information, see our full Launch CR529 review.
Best Pro-Level OBD2 Scanner
Topdon Phoenix Lite 2 Professional OBD2 Scanner
4. Topdon Phoenix Lite 2
The Topdon Phoenix Lite 2 is the best pro-level OBD2 scanner for users who demand advanced diagnostics and professional-grade features, blurring the lines between amateur and expert use.
Read our Expert Review of Topdon Phoenix Lite 2
Key Features:
- Display: 8-inch Color Touchscreen
- Connectivity: Wireless Bluetooth & Wi-Fi, Handheld
- I/M Readiness Test: Yes
- Live Data: Yes
- Warranty: 2 Years
Pros:
- Professional-grade diagnostic capabilities.
- Versatile wireless and handheld operation.
- Large, user-friendly 8-inch touchscreen.
- Extensive diagnostic tests and live data options.
- Includes adapters and a protective hard case.
Cons:
- Higher price point.
- Bulky and heavier than basic scanners.
- Subscription required for updates after two years.
The Topdon Phoenix Lite 2 is a premium OBD2 scanner packed with features that cater to both serious DIYers and professional mechanics. While it comes with a higher price tag, the investment unlocks a wealth of advanced diagnostic capabilities. Its wireless design, with a Bluetooth receiver connecting to the OBD port, offers unparalleled freedom of movement around the vehicle. The large touchscreen interface is intuitive and displays a wealth of data, including live data graphs and detailed fault information.
The Phoenix Lite 2 goes beyond basic OBD2 functions, offering advanced tests and features typically found in professional workshop scanners. While its size and weight might be less convenient for casual users, its rugged design and included hard case make it ideal for demanding environments. For users who require comprehensive diagnostics and professional-level features, the Topdon Phoenix Lite 2 is a top-tier choice.
Read our comprehensive Topdon Phoenix 2 Lite review for a detailed analysis.
Best Dual-Purpose OBD2 Scanner
Ancel BD310 OBD2 Scanner Displaying Engine Data
5. Ancel BD310
The Ancel BD310 is the best dual-purpose OBD2 scanner thanks to its ability to function as both a diagnostic tool and a supplementary vehicle display.
Read our Expert Review of Ancel BD310
Key Features:
- Display: 2-inch Color Screen
- Connectivity: Handheld, Bluetooth
- I/M Readiness Test: Yes
- Live Data: Yes
- Warranty: 3 Years
Pros:
- Lightweight and compact design.
- Functions as both a scanner and a secondary car display.
- Offers handheld and Bluetooth scanning options.
Cons:
- Minimalist interface may lack visual richness.
- Small 2-inch screen.
The Ancel BD310 stands out for its versatility. Beyond its core OBD2 scanning capabilities, it can connect to your smartphone via Bluetooth and display real-time engine parameters, effectively acting as a secondary dashboard display. Its compact and lightweight design makes it incredibly portable and easy to store in your glove compartment.
While the small screen and minimalist interface are compromises made for portability, the BD310 still provides essential diagnostic functions, including I/M readiness checks and performance data readings. Its dual functionality and ease of use make it a practical choice for everyday car owners who want a scanner that can also enhance their driving experience.
Explore our full Ancel BD310 review for a complete overview.
Best OBD2 Scanner with Companion App
Carly OBD-II Scanner and App Interface
6. Carly OBD-II Scanner
The Carly OBD-II Scanner is the best OBD2 scanner with a companion app, offering a seamless and feature-rich mobile experience that enhances its diagnostic capabilities.
Read our Expert Review of Carly OBD-II Scanner
Key Features:
- Display: App-Based (Smartphone Required)
- Connectivity: Bluetooth
- I/M Readiness Test: No
- Live Data: Yes
- Warranty: Lifetime
Pros:
- Intuitive and user-friendly app interface.
- Extensive customization options within the app.
- Live data display and logging.
- Covers maintenance and repair procedures.
- Lifetime warranty and updates.
Cons:
- Feature availability varies depending on car make and model.
- Subscription required for full app functionality beyond basic OBD2 features, which can be costly.
The Carly OBD Scanner distinguishes itself with its exceptional companion app. While many Bluetooth OBD2 scanners offer basic apps, Carly provides a polished and feature-rich mobile interface that significantly enhances the user experience. The app offers a wide range of functions, from diagnosing issues and clearing fault codes to providing repair guidance and even used car checks. The level of customization and professional-level tests available within the app are particularly impressive.
However, it’s important to note that the Carly’s feature set is car-dependent, with European brands like VW, BMW, and Ford enjoying the most comprehensive support. Accessing the full potential of the Carly app beyond basic OBD2 functions requires a subscription, which can add to the overall cost. Despite this, the Carly OBD Scanner and its companion app offer a premium and powerful diagnostic experience, especially for owners of compatible vehicles.
Explore our detailed Carly OBD scanner review for more information.
Other OBD2 Scanners We’ve Tested
Innova CarScan Mobile 1000 Bluetooth OBD2 Scanner in Use
7. Innova CarScan Mobile 1000
Innovative Features in a Compact Bluetooth Scanner
Read our Expert Review of Innova CarScan Mobile 1000
Key Features:
- Display: App-Based (Smartphone Required)
- Connectivity: Bluetooth
- I/M Readiness Test: Yes
- Live Data: Yes
- Warranty: 1 Year
Pros:
- Easy setup process.
- Small and highly portable.
- Excellent companion app with predictive diagnostics.
- Repair suggestions and parts information.
- Can function as a standalone gauge display.
Cons:
- Requires two separate apps for full functionality.
- Apps contain advertisements.
The Innova CarScan Mobile 1000 is a standout Bluetooth OBD2 scanner for its innovative features and ease of use. Its incredibly simple setup process and compact size make it exceptionally convenient. Like its higher-end sibling, the Innova 6100P, it offers predictive diagnostics, repair suggestions, and parts information within its companion app. It can also transform your smartphone into a set of automotive gauges, displaying real-time engine data.
While the reliance on two separate apps and the presence of ads within those apps are minor drawbacks, the CarScan Mobile 1000 delivers a wealth of features in a small and affordable package.
Read the complete Innova CarScan Mobile 1000 review for a detailed assessment.
ThinkCar ThinkDiag TKD01 Bluetooth OBD2 Scanner
8. ThinkCar ThinkDiag TKD01
Reliable Diagnostics with Subscription-Based Features
Read our Expert Review of ThinkCar ThinkDiag TKD01
Key Features:
- Display: App-Based (Smartphone Required)
- Connectivity: Bluetooth
- I/M Readiness Test: Yes
- Live Data: Yes
- Warranty: 1 Year
Pros:
- Reads enhanced and manufacturer-specific codes.
- Offers a wide range of optional functions.
- Includes a hard carry case for protection.
Cons:
- Subscription fee required after the first year for app access.
- Larger and heavier than some Bluetooth scanners.
- Initial setup can be slightly complex.
The ThinkCar ThinkDiag TKD01 is a robust Bluetooth OBD2 scanner designed for comprehensive diagnostics. Its compatibility with over 100 vehicle brands and ability to read manufacturer-specific codes make it a versatile tool. The ThinkDiag app provides access to enhanced fault codes and system monitoring, similar to higher-end scanners. It also includes predictive maintenance features, although it lacks repair guidance.
However, the ThinkDiag TKD01 requires a subscription after the first year to maintain full app functionality, which is a significant consideration. Its larger size and slightly more involved setup are minor drawbacks compared to its diagnostic capabilities.
Read our detailed ThinkCar ThinkDiag TKD01 review for a complete analysis.
Autel AutoLink AL539 OBD2 Scanner with Multimeter
9. Autel AutoLink AL539
Ideal for Electrical System Diagnostics
Read our Expert Review of Autel AutoLink AL539
Key Features:
- Display: 2.8-inch Color Screen
- Connectivity: Handheld
- I/M Readiness Test: Yes
- Live Data: Yes
- Warranty: 1 Year
Pros:
- Integrated electrical multimeter for circuit testing.
- Battery testing capabilities.
- Includes a stand for hands-free use.
Cons:
- Multimeter and OBD2 scanner functions cannot be used simultaneously.
- Battery requires charging.
The Autel AutoLink AL539 stands out with its unique integrated multimeter, allowing users to diagnose electrical issues alongside standard OBD2 diagnostics. This multimeter functionality enables testing for continuity, voltage, and current in car electrical systems, including circuits, fuses, and alternators. As an OBD2 scanner, it offers live data display and pre-inspection readiness checks.
While the inability to use the multimeter and OBD2 scanner simultaneously and the need to charge its battery are limitations, the Autel AutoLink AL539 is a valuable tool for users who frequently troubleshoot electrical problems in their vehicles.
Explore our full Autel AutoLink AL539 review for more details.
Frequently Asked Questions About OBD2 Scanners
What is an OBD2 Scanner?
An OBD2 scanner is a diagnostic tool that connects to your car’s On-Board Diagnostics II (OBD2) port to access data from the vehicle’s computer system. Mechanics use these scanners to diagnose car problems, but they are also available to car owners for personal use. Basic OBD2 scanners can read and interpret diagnostic trouble codes (DTCs) generated by the car when it detects an issue. More advanced scanners offer real-time system monitoring, predictive diagnostics, and repair information.
What is the OBD2 Port?
The OBD2 port is a standardized connector found in almost all passenger vehicles sold in the United States since 1996, and in other regions including Canada, Europe, Australia, Mexico, and New Zealand in subsequent years. This port serves as the interface point for accessing the car’s computer system. Besides OBD2 scanners, other devices like insurance trackers and dashcams can also utilize this port.
Locate your car’s OBD2 port with this guide for North American vehicles. For worldwide OBD2/EOBD port locations, refer to this resource.
What is a DTC?
DTC stands for Diagnostic Trouble Code. It’s an error code generated by a car’s OBD system when a problem is detected. OBD2 scanners read these DTCs to help users understand the nature of the issue. While many DTCs are standardized across vehicle makes and models, some manufacturers utilize proprietary codes specific to their vehicles.
Understanding DTC Meanings
DTCs may appear cryptic at first glance, but they follow a logical structure. The first character indicates the affected vehicle system:
- P – Powertrain (engine and transmission)
- B – Body (cabin and accessories)
- C – Chassis (braking and suspension)
- U – Network (communication systems)
The second character is a number indicating code type: 0 for generic codes and 1 for manufacturer-specific codes. 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 controls
- 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 final two characters pinpoint the specific fault within the identified system, ranging from 00 to 99. OBD2 scanners typically provide descriptions of these codes, and advanced models offer more detailed information. Numerous online resources, including Google, can help decipher DTC meanings. It’s important to remember that not all DTCs signify critical problems; some may indicate minor issues like a slightly elevated engine temperature.
Choosing the Best OBD2 Scanner for Your Needs
Investing in the best OBD2 scanner can provide valuable insights into your vehicle’s health. It’s the same technology used by dealerships and repair shops to diagnose issues, putting diagnostic power in your hands. OBD2 scanners come in two main types:
- Handheld OBD2 scanners: These are standalone devices with a built-in screen and a cable to connect to the OBD2 port.
- Wireless OBD2 scanners: These plug into the OBD2 port and communicate wirelessly via Bluetooth to a smartphone or tablet for data display.
High-quality OBD2 scanners are available across various price points, with some costing under $30 and many performing well under $200. Key factors to consider when choosing an OBD2 scanner include:
- Ease of Setup: A user-friendly setup ensures you’ll readily use the scanner when needed.
- Fault Code Explanation: The best scanners not only display fault codes but also provide clear explanations, aiding in DIY repairs or mechanic communication.
- I/M Readiness Check: This feature verifies emissions system readiness for state inspections.
- Accuracy: Reliable and accurate readings are crucial for effective diagnostics.
- Size and Weight: A compact and lightweight scanner is more likely to be kept in your car for on-the-go diagnostics.
- Live Data Display: Real-time data monitoring helps in diagnosing intermittent issues.
- Data Graphing: Visual data representation, especially graphs, enhances data analysis.
- Warranty: Look for scanners with a solid warranty, ideally lifetime or extended coverage.
When selecting an OBD2 scanner, first decide between a handheld unit or a wireless model that pairs with your phone. Consider longevity by choosing a scanner with lifetime updates or a strong warranty. For handheld scanners, prioritize screen size and clarity. Ruggedness and durability are important if you anticipate using the scanner in demanding environments. Extra features like a built-in multimeter, manufacturer-specific code reading, and data export capabilities can also be beneficial. Ultimately, even sophisticated OBD2 scanners are available at reasonable prices, often costing less than an hour of mechanic labor, making them a worthwhile investment for proactive car maintenance.
Our OBD2 Scanner Testing Methodology
To rigorously evaluate OBD2 scanners, we conduct hands-on testing using a 2014 Audi A4 Allroad over several weeks in various driving conditions. Our testing process involves:
- VIN Verification: Ensuring each scanner correctly identifies the vehicle identification number (VIN).
- Connectivity Testing: For wireless scanners, we assess Bluetooth and Wi-Fi connection stability with devices like iPads, Surface tablets, and Samsung Galaxy smartphones. Handheld scanners are tested for direct OBD2 port connectivity.
- Range and Cable Length Measurement: We measure the cable length of handheld scanners and the wireless range of Bluetooth models.
- Live Data Monitoring: With the engine running, we monitor engine parameters and vital systems using each scanner.
- Fault Code Simulation and Reading: We simulate a fault by disconnecting the engine oil temperature sensor to evaluate fault code detection and accuracy.
- Fault Code Clearing: We assess the scanner’s ability to clear the simulated fault code and turn off the check engine light after resolving the issue.
- Road Testing and Data Display Evaluation: We conduct road tests to observe real-time data display, noting whether data is presented numerically, graphically, or via gauges.
Our comprehensive testing methodology ensures that our OBD2 scanner recommendations are based on thorough evaluation and real-world performance.
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