The modern car is a complex computer on wheels, and when something goes wrong, or even when that pesky check engine light illuminates, it’s the onboard computer that usually holds the answers. An OBD-II scanner acts as your personal translator, connecting to this computer and revealing the hidden data within. Instead of relying solely on expensive mechanics, you can use an OBD-II scanner to understand your car’s health and potentially save money on repairs.
For those new to the world of car diagnostics, OBD-II scanners can seem intimidating. But fear not! We’ve spent years testing various OBD-II scanners, especially focusing on Bluetooth models, to help you find the best tool for your needs. Bluetooth OBD 2 scanners offer the convenience of wireless connectivity, allowing you to use your smartphone or tablet as the diagnostic display. This review dives into the top Bluetooth OBD 2 scanners available, highlighting their strengths and weaknesses to guide your purchase decision.
Among the standout Bluetooth options we’ve tested is the Topdon TopScan, a wireless scanner that packs impressive diagnostic capabilities in a compact form. For users seeking affordability, the Launch CR529 is a budget-friendly wired option we’ve previously recommended, although this review is focused on Bluetooth scanners. And for those who demand professional-level features in a Bluetooth device, while the Topdon Phoenix Lite 2 is a more comprehensive (though not exclusively Bluetooth) system, we will explore Bluetooth scanners that offer advanced features without the hefty price tag of professional tools.
Here’s a curated list of the best OBD 2 Bluetooth scanners you can buy right now, based on our hands-on evaluations.
Top OBD 2 Bluetooth Scanners: Quick Picks
This quick list highlights our top recommendations for Bluetooth OBD 2 scanners. Scroll down for more detailed reviews of each scanner and what makes them stand out.
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Topdon TopScan: The best overall Bluetooth OBD 2 scanner, offering an easy setup and a wide array of professional-grade features in a compact, wireless design.
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Ancel BD310: Best dual-purpose Bluetooth OBD 2 scanner, functioning as both a handheld scanner and a supplementary dashboard display when connected to your smartphone.
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Carly OBD-II Scanner: Best Bluetooth OBD 2 scanner with a companion app, providing an exceptional user experience with extensive customization and professional-level tests, especially for specific car brands like VW, BMW, and Ford.
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Innova CarScan Mobile 1000: A highly innovative Bluetooth OBD 2 scanner with predictive diagnosis capabilities and a remarkably simple setup process.
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ThinkCar ThinkDiag TKD01: A robust and durable Bluetooth OBD 2 scanner with extensive manufacturer-specific error codes and fault-code clearing capabilities.
Deep Dive: Best OBD 2 Bluetooth Scanners Reviewed
Why Trust Tom’s Guide? Our team of expert reviewers rigorously tests and evaluates products to provide unbiased and comprehensive recommendations. Learn more about our testing methodology.
1. Topdon TopScan: Best Mobile OBD-II Scanner
The Topdon TopScan stands out as the best mobile OBD-II scanner due to its seamless Bluetooth connectivity, user-friendly app, and a wealth of diagnostic features typically found in more expensive, professional-grade tools. Don’t let its small size fool you; this compact scanner is packed with power and versatility.
Expert Review:
The Topdon TopScan immediately impressed us with its effortless Bluetooth setup. Pairing with a smartphone app is incredibly straightforward, making it accessible even for OBD-II novices. Beyond basic error code reading and I/M Readiness tests, the TopScan offers advanced functionalities that set it apart from competitors in its class.
One of the most notable features is its ability to assess vehicle performance and efficiency. It can even estimate horsepower and torque, capabilities rarely seen in scanners at this price point. Whether you’re looking to optimize your car’s performance or simply ensure its roadworthiness, the TopScan is an invaluable tool.
Key Features and Benefits:
- Extensive Diagnostic Coverage: Offers comprehensive diagnostics, going beyond basic OBD-II functions.
- Live Data Stream: Provides real-time data monitoring for in-depth analysis of vehicle performance.
- Performance Indicators: Unique performance and efficiency checks, including horsepower and torque estimation.
- Maintenance Features: Covers various maintenance aspects, aiding in proactive vehicle care.
- User-Friendly App: Intuitive and easy-to-navigate app interface for seamless operation.
Drawbacks:
- Size of Transmitter: The Bluetooth transmitter module is relatively large, which might be slightly cumbersome in tight spaces.
- Subscription for Full Features: Some advanced features may require a subscription after the initial year of use.
Bottom Line: The Topdon TopScan is an exceptional OBD 2 Bluetooth scanner that delivers professional-level diagnostics in a user-friendly and mobile package. Its comprehensive features and ease of use make it our top pick for the best mobile OBD-II scanner.
Read our full Topdon TopScan review
2. Ancel BD310: Best Dual-Purpose Bluetooth Scanner
The Ancel BD310 distinguishes itself as a versatile dual-purpose OBD 2 Bluetooth scanner, functioning both as a traditional handheld device and a Bluetooth-enabled scanner that can augment your car’s dashboard. This unique functionality, combined with its compact design and ease of use, makes it a standout choice.
Expert Review:
We were impressed by the Ancel BD310’s ability to seamlessly transition between a handheld scanner and a Bluetooth-connected device. When paired with a smartphone, it can display real-time engine data directly on your phone screen, effectively turning your phone into a secondary dashboard. This is particularly useful for monitoring engine parameters while driving or during diagnostic tests.
Its compact and lightweight design makes the BD310 incredibly portable and convenient to store in your glovebox. While the 2-inch screen is on the smaller side, and the four-button interface is somewhat basic, these factors don’t detract significantly from its diagnostic capabilities. The 56-inch cable provides ample reach, and it performs all essential OBD-II functions, including I/M readiness tests and displaying crucial performance data.
Key Features and Benefits:
- Dual-Purpose Functionality: Operates as both a handheld and Bluetooth scanner.
- Secondary Car Display: Can display engine specs on your smartphone via Bluetooth.
- Compact and Lightweight: Easy to store and carry, ideal for on-the-go diagnostics.
- Comprehensive OBD-II Functions: Supports I/M readiness tests, live data streaming, and fault code reading.
- Reasonable Price: Offers excellent value for its features and capabilities.
Drawbacks:
- Minimalist Interface: The interface is quite basic and may lack some advanced features found in higher-end scanners.
- Small Screen: The 2-inch display can be limiting for users who prefer larger screens for data visualization.
Bottom Line: The Ancel BD310 is an excellent OBD 2 Bluetooth scanner that provides a unique dual-purpose functionality, combining handheld convenience with Bluetooth connectivity and dashboard augmentation. Its versatility and portability make it a highly practical tool for car owners.
Read our full Ancel BD310 review
3. Carly OBD-II Scanner: Best Companion App Experience
The Carly OBD-II Scanner truly shines due to its exceptional companion app, offering a user-friendly interface and a wide range of advanced features, especially beneficial for owners of VW, BMW, and Ford vehicles. While the scanner hardware itself is solid, it’s the app experience that elevates Carly above many competitors in the Bluetooth OBD 2 scanner market.
Expert Review:
The standout feature of the Carly OBD-II Scanner is undoubtedly its companion app. In a market where many Bluetooth scanner apps are basic and clunky, Carly’s app is polished, intuitive, and packed with features. It goes far beyond simple code reading and offers customization options, professional-level tests, and even repair assistance.
For owners of compatible vehicles, particularly VW, BMW, and Ford, the Carly app unlocks a wealth of brand-specific diagnostics and customizations. From checking used car history to accessing advanced control unit parameters, the app provides deep insights into your vehicle’s systems. The lifetime warranty on the scanner hardware is also a significant plus.
Key Features and Benefits:
- Exceptional Companion App: User-friendly, feature-rich app with extensive customization options.
- Brand-Specific Features: Optimized for VW, BMW, and Ford vehicles with advanced diagnostics and customizations.
- Repair Assistance: Provides repair help and resources to guide you through vehicle maintenance.
- Used Car Check: Tools to assess the condition of used vehicles, helping to avoid buying a lemon.
- Lifetime Warranty: Offers a lifetime warranty on the scanner hardware, ensuring long-term reliability.
Drawbacks:
- Car Compatibility Limitations: Full feature set is not available for all car models; compatibility varies by brand and model year.
- Subscription Costs: Access to advanced features beyond basic OBD-II functions requires an ongoing subscription, which can become expensive.
Bottom Line: The Carly OBD-II Scanner is a top choice for users who prioritize a seamless app experience and brand-specific features, especially those with VW, BMW, or Ford vehicles. Its powerful app and extensive capabilities make it a worthwhile investment, provided your car is fully compatible and you are willing to consider the subscription costs for advanced features.
Read our full Carly OBD scanner review
4. Innova CarScan Mobile 1000: Innovative Bluetooth Scanner
The Innova CarScan Mobile 1000 stands out for its innovative features, particularly predictive diagnostics, within a user-friendly Bluetooth OBD 2 scanner package. It combines the trusted Innova brand reputation with the convenience of wireless smartphone connectivity.
Expert Review:
Innova is a well-respected name in vehicle diagnostics, and the CarScan Mobile 1000 lives up to that reputation by bringing advanced features to a Bluetooth-enabled device. One of its most compelling features is predictive diagnostics, which goes beyond simply reading current error codes and attempts to anticipate potential future issues. This proactive approach can help prevent breakdowns and costly repairs.
The setup process for the CarScan Mobile 1000 is remarkably simple, making it accessible for users of all technical skill levels. The wireless Bluetooth connection is reliable, and the companion app is well-designed and easy to navigate. It offers a comprehensive set of OBD-II functions, along with Innova’s signature features, in a convenient mobile format.
Key Features and Benefits:
- Predictive Diagnostics: Anticipates potential future vehicle problems for proactive maintenance.
- Simple Setup: Extremely easy and quick to set up and start using.
- Trusted Brand: Comes from Innova, a reputable and established brand in automotive diagnostics.
- Comprehensive OBD-II Functions: Supports all standard OBD-II diagnostic functions.
- User-Friendly App: Intuitive and well-designed companion app for iOS and Android.
Drawbacks:
- Specific Feature Details Limited: Information on the specifics of the predictive diagnostics feature could be more detailed.
- Price Point: May be slightly more expensive than some basic Bluetooth OBD-II scanners due to its advanced features.
Bottom Line: The Innova CarScan Mobile 1000 is an excellent choice for users seeking an innovative and feature-rich Bluetooth OBD 2 scanner from a trusted brand. Its predictive diagnostics and ease of use make it a valuable tool for proactive vehicle maintenance.
Read the full Innova CarScan Mobile 1000 review
5. ThinkCar ThinkDiag TKD01: Durable and Feature-Rich Bluetooth Scanner
The ThinkCar ThinkDiag TKD01 is a robust and feature-rich Bluetooth OBD 2 scanner, known for its durability and extensive diagnostic capabilities, including manufacturer-specific error codes and fault-code clearing. While slightly larger than some Bluetooth scanners, its ruggedness and advanced features make it a compelling option.
Expert Review:
The ThinkCar ThinkDiag TKD01 immediately impresses with its solid, almost indestructible build quality. While its size is larger than some compact Bluetooth scanners, this bulk translates to exceptional durability, making it well-suited for demanding environments. It offers a wide range of features, including access to manufacturer-specific error codes, which provides deeper diagnostic insights compared to generic OBD-II scanners.
One standout feature is its ability to clear minor fault codes directly, potentially resolving small issues without needing a mechanic. The ThinkDiag TKD01 also offers a comprehensive suite of diagnostic functions and live data streaming. However, it’s worth noting that a subscription is required after the first year to maintain access to all features and updates.
Key Features and Benefits:
- Exceptional Durability: Rugged and robust construction, built to withstand tough conditions.
- Manufacturer-Specific Codes: Accesses manufacturer-specific error codes for in-depth diagnostics.
- Fault-Code Clearing: Can clear minor fault codes directly, potentially resolving issues without professional help.
- Comprehensive Diagnostics: Offers a wide array of diagnostic functions and live data streaming.
- Solid Performance: Reliable Bluetooth connectivity and consistent performance.
Drawbacks:
- Larger Size: Bulkier than some other Bluetooth OBD-II scanners, which may reduce portability.
- Subscription Required: Full functionality and updates require a subscription after the first year.
Bottom Line: The ThinkCar ThinkDiag TKD01 is a top-tier Bluetooth OBD 2 scanner for users who need a durable, feature-rich device with advanced diagnostic capabilities, including manufacturer-specific codes and fault clearing. Its ruggedness and performance make it a worthwhile investment, particularly for those who need a scanner that can handle demanding use.
Read our full ThinkCar ThinkDiag TKD01 review.
Understanding OBD-II Scanners: FAQs
What is an OBD-II Scanner?
An OBD-II (On-Board Diagnostics II) scanner is a tool that connects to your car’s onboard computer system via the OBD-II port. It allows you to read diagnostic trouble codes (DTCs), monitor live data from various vehicle systems, and perform other diagnostic tests. Mechanics use these scanners to diagnose car problems, and now, with affordable and user-friendly options, car owners can also benefit from this technology.
What is the OBD-II Port?
The OBD-II port is a standardized connector found in virtually all passenger vehicles sold in the United States since 1996, and in other regions like Canada, Europe, and Australia in subsequent years. This port provides access to the car’s computer and is typically located under the dashboard on the driver’s side. Besides scanners, other devices like insurance trackers and dashcams can also utilize this port.
Find your car’s OBD-II port location (North America)
Find your OBD-II/EOBD port worldwide
What is a DTC (Diagnostic Trouble Code)?
A DTC, or Diagnostic Trouble Code, is an error code generated by your car’s OBD system when it detects a problem. These codes are read by OBD-II scanners to help identify the source of the issue. While many DTCs are standardized across car manufacturers, some are manufacturer-specific.
Decoding DTCs: What Do They Mean?
DTCs might seem like random characters, but they follow a logical structure. The first character indicates the affected system:
- P – Powertrain (engine, transmission)
- B – Body (interior, airbags, etc.)
- C – Chassis (brakes, suspension, steering)
- N – Network (communication systems)
The second character is a number: 0 for generic codes and 1 for manufacturer-specific codes. The third character specifies the subsystem:
- 1 – Fuel and air metering
- 2 – Injector circuit (fuel and air metering)
- 3 – Ignition system or misfire
- 4 – Auxiliary emissions
- 5 – Vehicle speed controls and idle control
- 6 – Computer auxiliary outputs
- 7, 8, 9 – Transmission and gearbox
- A, B, C – Hybrid propulsion systems
The fourth and fifth characters pinpoint the exact fault, ranging from 00 to 99. OBD-II scanners often provide descriptions of these codes, but further research online may be needed for detailed understanding. It’s important to remember that not all DTCs indicate critical problems; some may be minor warnings.
Choosing the Right OBD 2 Bluetooth Scanner
Selecting the best OBD 2 Bluetooth scanner depends on your specific needs and priorities. Bluetooth scanners offer wireless convenience and typically pair with smartphones or tablets for display and control. Here are key factors to consider:
- Ease of Setup: A scanner should be easy to set up and connect, especially Bluetooth models.
- Fault Code Explanation: The best scanners provide not just the fault codes but also clear explanations of their meaning.
- I/M Readiness Check: Essential for emissions testing, this feature verifies if your car will pass inspection.
- Accuracy: Reliable and accurate diagnostic results are crucial for effective troubleshooting.
- Size and Portability: Compact and lightweight scanners are easier to handle and store in your car.
- Live Data Display: Real-time data monitoring helps diagnose intermittent issues and assess vehicle performance.
- Graphing Capabilities: Visual data representation through graphs can be more insightful than raw numbers.
- Warranty and Updates: Look for scanners with good warranties and software updates to ensure longevity and compatibility with newer vehicles.
Bluetooth vs. Handheld Scanners: Decide whether you prefer the wireless convenience of a Bluetooth scanner that uses your smartphone as a display or a traditional handheld scanner with its own built-in screen.
Longevity and Support: Choose a scanner with a good warranty and software updates to ensure it remains useful over time.
Screen Size (for Handheld): If considering a handheld scanner, opt for a large, bright, and easy-to-read display.
Extra Features: Some scanners offer additional features like multimeters, manufacturer-specific code access, or PDF report generation.
Price: OBD-II scanners range in price, with many capable Bluetooth models available for under $100, offering excellent value compared to professional diagnostic services.
Our OBD-II Scanner Testing Methodology
To evaluate OBD-II scanners, including Bluetooth models, we conduct hands-on testing using a 2014 Audi A4 Allroad. Our testing process includes:
- VIN Verification: Ensuring the scanner correctly reads and reports the vehicle identification number (VIN).
- Connectivity Testing: For Bluetooth scanners, we test pairing and connection stability with various devices (smartphones, tablets). For handhelds, cable length is assessed.
- Live Data Monitoring: We monitor engine and system data in real-time to evaluate data accuracy and display.
- Fault Code Generation and Reading: We simulate a fault by disconnecting a sensor (e.g., oil temperature sensor) and verify the scanner accurately detects and reports the error code.
- Code Clearing: After resolving the simulated fault, we test the scanner’s ability to clear the check engine light and erase the error code.
- Road Testing: We conduct road tests to assess the scanner’s ability to display live operating data such as engine speed, coolant temperature, and timing, observing data presentation in numerical and graphical formats.
By following this rigorous testing methodology, we aim to provide comprehensive and reliable reviews to help you choose the best OBD 2 Bluetooth scanner for your needs.
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