The best OBD-II scanners are essential tools for modern car owners, acting as a bridge to your vehicle’s onboard computer and unlocking a wealth of diagnostic information. Whether you’re facing a mysterious dashboard light or suspect a mechanical issue, these scanners empower you to understand and address problems without immediately resorting to expensive professional services.
However, the market is flooded with OBD-II scanners, ranging from basic code readers to advanced professional-grade tools. Navigating this landscape can be daunting, especially for beginners. Having rigorously tested a wide array of OBD-II scanners over the years, we’ve compiled a list of the top performers that offer exceptional value for your money. Below, we’ll delve into our recommended scanners and provide a comprehensive guide on how OBD-II scanners function and deciphering those cryptic error codes.
Our curated selection includes the Topdon TopScan, a wireless marvel packed with features for in-depth diagnostics. For budget-conscious individuals, the Launch CR529, priced around $40, delivers impressive capabilities for its cost. And for those seeking a professional-level experience, the Topdon Phoenix Lite 2 provides advanced diagnostics, albeit at a premium of $799.
Here are our top recommendations for the best OBD-II scanners currently available, balancing performance and affordability.
Tom Pritchard
Tom is the Automotive Tech Editor at Tom’s Guide, specializing in vehicle technology and reviews. He is also a passionate advocate for electric vehicles.
Quick Recommendations: Best OBD-II Scanners for the Money
Based on hands-on testing and rigorous evaluation, here are the best OBD-II scanners you can buy now. Continue scrolling for detailed reviews and insights into each pick.
1. Topdon TopScan: Best Mobile OBD-II Scanner
The Topdon TopScan stands out as the most user-friendly Bluetooth scanner we tested, offering a suite of professional-grade features in a compact design. It provides comprehensive diagnostics, repair guidance, parts information, and even predictive analysis to anticipate potential issues.
Explore the Topdon TopScan in Detail
2. Launch CR529: Best Budget-Friendly OBD-II Scanner
The Launch CR529 is a small yet powerful scanner that delivers essential OBD-II functions and even some advanced features typically found in more expensive models. It includes lifetime support and updates, making it an exceptional value proposition.
Discover Why the Launch CR529 is the Best Cheap OBD-II Scanner
3. Topdon Phoenix Lite 2: Best Rugged and Professional-Grade OBD-II Scanner
Resembling a robust handheld gaming console, the Topdon Phoenix Lite 2 is built for both professionals and serious DIYers. Beyond its durable design, it offers advanced diagnostic capabilities for comprehensive vehicle analysis.
Learn More About the Topdon Phoenix Lite 2’s Professional Features
4. Ancel BD310: Best Dual-Purpose OBD-II Scanner
The Ancel BD310 functions effectively as an OBD-II scanner and can also serve as an auxiliary dashboard display, showing real-time engine data. It combines a sleek design, smartphone connectivity, and an attractive price.
Explore the Dual Functionality of the Ancel BD310
5. Carly OBD-II Scanner: Best OBD-II Scanner with Companion App
The Carly OBD-II Scanner’s value is highly dependent on your vehicle make, with brands like VW, BMW, and Ford benefiting most from its extensive features. Its standout feature is its exceptional companion app, offering extensive customization and professional-level tests.
Discover the Power of the Carly OBD-II Scanner App
Deep Dive: The Best OBD-II Scanners for Different Needs
Why Trust Tom’s Guide? Our team of expert reviewers dedicates countless hours to hands-on testing and analysis of products and services to bring you unbiased and reliable recommendations. Learn more about our rigorous testing methodology.
1. Topdon TopScan: The Best Mobile OBD-II Scanner for Comprehensive Car Diagnostics
(Image credit: Topdon)
Topdon TopScan: Perfect for Unlocking Your Car’s Full Diagnostic Potential
Read our expert 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
- Size: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Extensive vehicle diagnostic coverage.
- Comprehensive live data monitoring.
- Unique performance indicators (horsepower, torque estimation).
- Maintenance item coverage.
Reasons to Avoid:
- Larger transmitter module.
- Subscription required for some advanced features after the first year.
Despite its unassuming appearance, the Topdon TopScan packs a powerful punch. This Bluetooth OBD-II module goes beyond basic code reading, offering features that rival scanners ten times its price. It excels in performance and efficiency analysis, even estimating horsepower and torque, making it invaluable for both fine-tuning and routine maintenance. For users seeking in-depth diagnostics and performance insights, the Topdon TopScan is an exceptional tool for your automotive toolkit.
Read our full Topdon TopScan review.
2. Launch CR529: The Best Cheap OBD-II Scanner for Incredible Value
(Image credit: Future)
Launch CR529: Unbeatable OBD-II Scanning Under $50
Read our expert review:
Key Specifications:
- Display: 2.8-inch Color Screen
- Connectivity: None (Handheld)
- Handheld: Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: 8 Physical Buttons
- Warranty: 1 year
- Size: 6.5 x 3.8 x 1.2 inches
- Weight: 11 ounces
Reasons to Buy:
- Extremely affordable.
- Lifetime free updates.
- Easy pre-inspection report generation.
Reasons to Avoid:
- Lacks manufacturer-specific diagnostic codes.
- Feels somewhat heavy.
- Shorter 1-year warranty.
The Launch CR529 redefines value in OBD-II scanners. Priced under $50, it delivers a surprising level of diagnostic capability. While compromises exist, such as the absence of manufacturer-specific codes and a slightly heavier build, it offers essential features like live data, instant inspection reports, and lifetime updates without subscription fees. For users seeking a reliable and budget-friendly OBD-II scanner for general car maintenance and diagnostics, the CR529 is an outstanding choice.
Read our full Launch CR529 review.
3. Topdon Phoenix Lite 2: The Best Professional-Level OBD-II Scanner for Advanced Diagnostics
(Image credit: Future)
Topdon Phoenix Lite 2: Bridging the Gap Between DIY and Professional Car Diagnostics
Read our expert review:
Key Specifications:
- Display: 8-inch Color Touchscreen
- Connectivity: Bluetooth, Wi-Fi
- Handheld: Yes (Tablet-style)
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: Touchscreen Interface
- Warranty: 2 years
- Size: 10.2 x 7.2 x 1.7 inches
- Weight: 2.6 pounds
Reasons to Buy:
- Professional-grade OBD scanner capabilities.
- Hybrid handheld design with Wi-Fi and Bluetooth connectivity.
- Large 8-inch touchscreen display.
- Extensive suite of diagnostic tests and live data options.
- Includes adapters and a protective hard case.
Reasons to Avoid:
- Bulky and heavy, can be cumbersome.
- Higher price point.
- Subscription required after two years for updates.
The Topdon Phoenix Lite 2 commands a higher price, but justifies it with a feature set that caters to both experienced DIYers and professional mechanics. Its wireless operation, enabled by a Bluetooth receiver, allows for freedom of movement around the vehicle. The rugged design and included kickstand make it workshop-ready. Beyond standard OBD-II functions, it offers advanced features like live data graphing and comprehensive fault information. While the subscription cost after two years is a factor, the Phoenix Lite 2 provides near-professional diagnostic power for serious automotive enthusiasts.
Read our full Topdon Phoenix Lite 2 review.
4. Ancel BD310: The Best Dual-Purpose OBD-II Scanner for Added Functionality
Ancel BD310 (Image credit: Tom’s Guide)
Ancel BD310: A Versatile OBD-II Scanner That Does Double Duty
Read our expert review:
Key Specifications:
- Display: 2-inch Color Screen
- Connectivity: Bluetooth
- Handheld: Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: 4 Physical Buttons
- Warranty: 3 years
- Size: 5.1 x 2.4 x 0.6 inches
- Weight: 5.4 ounces
Reasons to Buy:
- Lightweight and compact design.
- Functions as both a scanner and a secondary car display.
- Offers handheld and Bluetooth scanning capabilities.
Reasons to Avoid:
- Minimalist interface design.
- Small screen size.
The Ancel BD310 distinguishes itself with its dual functionality. It operates as a standard handheld OBD-II scanner and, via Bluetooth connection to a smartphone, transforms into a secondary dashboard display for real-time engine data. Its compact and lightweight design makes it easily storable, while still providing essential diagnostic features like I/M readiness tests and performance data readings. While the small screen and minimalist interface are drawbacks, the BD310’s versatility and portability make it a practical choice for everyday use.
Read our full Ancel BD310 review.
5. Carly OBD-II Scanner: The Best Companion App Experience for Customized Diagnostics
(Image credit: Carly)
Carly OBD-II Scanner: Unlock Car-Specific Features with a Powerful App
Read our expert 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
- Size: 2.9 x 1.5 x 0.7 inches
- Weight: 0.7 ounces
Reasons to Buy:
- User-friendly app interface.
- Extensive customization options.
- Live data visualization.
- Maintenance and repair features.
- Lifetime warranty and updates.
Reasons to Avoid:
- Feature availability varies significantly by car model.
- App subscription can be expensive for full functionality.
The Carly OBD Scanner stands out due to its exceptional companion app. While many Bluetooth scanners offer basic apps, Carly provides a feature-rich experience with repair assistance, used car checks, and extensive customization. Its lifetime warranty is a significant advantage. However, its functionality is car-dependent, with optimal performance for brands like VW, BMW, and Ford. The subscription model for advanced features is also a consideration. For users with compatible vehicles seeking deep customization and app-driven diagnostics, the Carly OBD-II Scanner is a compelling option.
Read our full Carly OBD scanner review.
Other OBD-II Scanners We’ve Tested: More Great Options to Consider
- Innova CarScan Mobile 1000 (★★★★☆): This Bluetooth scanner innovates with predictive diagnostics and a simple setup, offering impressive Innova features wirelessly through your smartphone. Read the full Innova CarScan Mobile 1000 review.
- ThinkCar ThinkDiag TKD01 (★★★★☆): While larger for a Bluetooth OBD-II scanner, the TKD01 is exceptionally durable. It offers manufacturer-specific error codes and advanced fault code analysis, potentially resolving minor issues without mechanic intervention. A $40 subscription is required after the first year. Read our full ThinkCar ThinkDiag TKD01 review.
- Autel AutoLink AL539 (★★★☆☆): Designed for electrical diagnostics, this OBD-II scanner includes a built-in multimeter for identifying electrical faults. 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 is an OBD-II Scanner?
OBD-II scanners are diagnostic tools that mechanics and car owners use to communicate with a vehicle’s onboard computer system. By plugging into the OBD port, these scanners access and interpret data related to the vehicle’s health and performance. Basic scanners read and identify diagnostic trouble codes (DTCs) triggered by detected issues. Advanced scanners offer real-time system monitoring and predictive analysis for potential problems.
What is the OBD-II Port?
The On-Board Diagnostics Version Two (OBD-II) port is a standardized connector found in virtually all passenger vehicles sold in the US since 1996, Canada since 1998, the EU since 2004, and other regions like Australia and Mexico. This port serves as the interface point for diagnostic tools, insurance telematics devices, and dashcams. If you’re unsure of your OBD-II port location, resources are available online to find your car’s OBD-II port in North American vehicles or worldwide OBD-II/EOBD port locations.
What is a DTC (Diagnostic Trouble Code)?
A DTC, or Diagnostic Trouble Code, is an error code generated by a vehicle’s OBD system when it detects a malfunction. These codes are read by OBD-II scanners, enabling users to diagnose vehicle issues. While many DTCs are standardized across car makes and models, some manufacturers use proprietary DTCs specific to their vehicles.
Understanding DTC Meanings:
DTCs might appear cryptic, but they follow a structured format. The first character indicates the affected vehicle system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character, a number, signifies if the code is generic (0) or manufacturer-specific (1). The third character specifies the subsystem involved (e.g., fuel and air metering, ignition system). The fourth and fifth characters pinpoint the precise fault within that subsystem, ranging from 00 to 99. OBD-II scanners translate these codes into understandable descriptions. Online resources and search engines can further assist in deciphering DTC meanings. While over 5,000 DTCs exist, not all indicate critical problems; some may signal minor issues like slightly elevated engine temperature.
DTC Subsystem Breakdown (Third Character):
- 1: Fuel and air metering
- 2: Injector circuit specific fuel and air metering
- 3: Ignition system or misfire
- 4: Auxiliary emissions
- 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
Choosing the Best OBD-II Scanner for Your Needs
For gaining insights into your vehicle’s operation and diagnosing potential problems, an OBD-II scanner is invaluable. It provides access to the same diagnostic information used by dealerships and repair shops. OBD-II scanners come in two main types:
- Handheld OBD-II scanners: Feature an integrated screen and cable for direct connection to the OBD port.
- Wireless OBD-II scanners: Connect to the OBD port and transmit data via Bluetooth to a smartphone or tablet.
High-quality OBD-II scanners are available across various price points, with effective options under $200 and even budget-friendly scanners under $30. Key factors to consider when selecting an OBD-II scanner include:
- Ease of Setup: A user-friendly setup ensures quick and convenient diagnostics.
- Fault Code Explanation: The scanner should not only display fault codes but also provide clear explanations for effective troubleshooting.
- I/M Readiness Check: This feature verifies emissions system readiness for state inspections.
- Accuracy: Reliable and accurate diagnostic results are paramount.
- Size and Weight: A compact and portable scanner is more likely to be readily available when needed.
- Live Data: Real-time data monitoring aids in identifying intermittent issues.
- Graphs: Visual data representation enhances analysis and comparison.
- Warranty: A robust warranty provides long-term peace of mind.
Consider whether you prefer a handheld scanner with an integrated display or a wireless scanner that utilizes your smartphone or tablet. Prioritize scanners with lifetime warranties or software updates for longevity and continued compatibility. For handheld scanners, opt for a large, clear, icon-based display. Rugged designs with shock-absorbing bumpers are beneficial for durability. Additional features like electrical multimeters, manufacturer-specific code reading, and PDF export capabilities can further enhance functionality. Ultimately, OBD-II scanners offer significant value, often costing less than an hour of professional mechanic labor.
How We Test OBD-II Scanners: Our Rigorous Evaluation Process
To evaluate OBD-II scanners, we conduct hands-on testing using a 2014 Audi A4 Allroad over several weeks in diverse driving conditions. Our testing process includes:
- VIN Verification: Ensuring the scanner accurately reads the vehicle identification number (VIN).
- Connectivity Testing: Verifying Bluetooth or Wi-Fi connectivity for wireless scanners with devices like iPads, Surface tablets, and Samsung Galaxy smartphones. Handheld scanners are tested for direct OBD-II port functionality.
- Range and Cable Length Measurement: Assessing wireless range and cable length for practical usability.
- Live Data Monitoring: Observing engine and system data in real-time while the vehicle is running.
- Fault Code Generation and Diagnosis: Simulating a fault by disconnecting the engine oil temperature sensor and assessing the scanner’s ability to identify, explain, and clear the resulting fault code.
- Road Testing: Evaluating the scanner’s performance in displaying dynamic operating data like engine speed, timing, and coolant temperature under real-world driving conditions, noting data presentation formats (numeric, graphs, gauges).
Our comprehensive testing methodology ensures that our OBD-II scanner recommendations are based on thorough, real-world performance evaluations.
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