The best OBD-II scanners are essential tools for modern car owners, offering a direct line to your vehicle’s onboard computer. Whether you’re facing a mysterious dashboard light or suspect an underlying issue, these scanners provide access to crucial diagnostic information, empowering you to understand and address car problems without immediately resorting to expensive professional services.
Navigating the world of OBD-II scanners can be daunting, especially for beginners. The market is flooded with options, each promising to be the best. Having rigorously tested a wide range of OBD-II scanners, we’ve curated a list of top recommendations. Below, we’ll guide you through our top picks and delve into how OBD-II scanners function and what those cryptic error codes actually signify.
Our top choices include the Topdon TopScan, a wireless marvel known for its user-friendliness and comprehensive diagnostic capabilities. For budget-conscious users, the Launch CR529, priced around $40, delivers exceptional value. If you’re seeking a professional-grade experience, the Topdon Phoenix Lite 2 offers advanced diagnostic features, albeit at a premium price of $799.
Here’s a quick rundown of the best OBD-II scanners available today.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, specializing in mobile technology and apps. He is also a passionate advocate for electric vehicles and deeply knowledgeable about automotive technology.
Quick Recommendations: Best OBD-II Scanners at a Glance
These are our top OBD-II scanner recommendations based on extensive hands-on testing. Continue reading for detailed reviews of each scanner and what makes them stand out.
Topdon TopScan – Best Mobile OBD-II Scanner
1. Topdon TopScan
The Topdon TopScan stands out as the easiest Bluetooth OBD-II scanner to set up, according to our tests. Despite its compact size, it packs professional-grade features, including comprehensive diagnostics, repair guidance, parts lists, and even predictive analysis to anticipate potential issues.
Explore the Topdon TopScan in Detail
Launch CR529 – Best Budget OBD-II Scanner
2. Launch CR529
The Launch CR529 is a compact yet powerful OBD-II scanner that delivers essential diagnostic functionalities and some advanced features typically found in higher-priced models. It also includes lifetime support and updates, making it an exceptionally valuable tool for its price.
Learn More About the Launch CR529
Topdon Phoenix Lite 2 – Best Professional OBD-II Scanner
3. Topdon Phoenix Lite 2
Resembling a robust handheld gaming device, the Topdon Phoenix Lite 2 is designed for both automotive professionals and serious DIY enthusiasts. This rugged scanner provides powerful diagnostics and is built to withstand demanding workshop environments.
Discover the Capabilities of the Topdon Phoenix Lite 2
Ancel BD310 – Best Dual-Purpose OBD-II Scanner
4. Ancel BD310
The Ancel BD310 is a versatile OBD-II scanner that not only performs diagnostic functions but also enhances your car’s dashboard by displaying real-time engine specifications. It combines ease of use with smartphone compatibility and affordability.
Read More About the Ancel BD310
Carly OBD-II Scanner – Best OBD-II Scanner with Companion App
5. Carly OBD-II Scanner
The Carly OBD-II Scanner’s utility is highly dependent on your vehicle’s make, with vehicles from VW, BMW, and Ford benefiting the most from its core features. Its standout feature is its exceptional companion app, offering extensive customization and professional-level diagnostic tests.
Explore the Carly OBD-II Scanner App Features
Deep Dive: Exploring the Best OBD-II Scanners
Why Trust Tom’s Guide? At Tom’s Guide, our commitment is to provide unbiased and thorough reviews. Our team of experts dedicates significant time to testing and analyzing products to ensure we recommend only the best. Learn more about our testing methodology.
Best Mobile OBD-II Scanner: Topdon TopScan
(Image credit: Topdon)
1. Topdon TopScan
Unlock Your Car’s Full Potential with Deep Diagnostics
Read our expert review
Specifications:
- Display/Size: None
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: None
- Warranty: 2 years
- Size: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Exceptional automotive diagnostic coverage
- Real-time live data monitoring
- Unique performance indicators
- Comprehensive maintenance item coverage
Reasons to Avoid:
- Bulky transmitter
- Subscription required for some features after one year
The Topdon TopScan redefines compact functionality in OBD-II scanners. More than just a basic Bluetooth module that transmits data to your smartphone app, the TopScan surpasses its competitors in diagnostic capabilities. Beyond standard fault detection and I/M Readiness tests, it offers advanced performance and efficiency checks, including estimations of horsepower and torque. Its comprehensive features rival scanners ten times its price, making it an invaluable tool for both fine-tuning your vehicle and ensuring roadworthiness.
Read our full Topdon TopScan review
Best Budget OBD-II Scanner: Launch CR529
(Image credit: Future)
2. Launch CR529
Unbeatable Value in OBD-II Diagnostics Under $50
Read our expert review
Specifications:
- Display/Size: Color/2.8-inches
- Bluetooth/Handheld: No/Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: 8
- Warranty: 1 year
- Size: 6.5 x 3.8 x 1.2 inches
- Weight: 11 ounces
Reasons to Buy:
- Highly affordable
- Lifetime software updates
- Easy pre-inspection report generation
Reasons to Avoid:
- Lacks manufacturer-specific codes
- Feels somewhat heavy
- Limited 1-year warranty
The Launch CR529 redefines value in OBD-II scanners, offering a surprising level of diagnostic features for its affordable price tag. While it omits manufacturer-specific codes and has a slightly heavier build, it compensates with live data, instant inspection reports, and comprehensive vehicle insights. Lifetime updates ensure long-term usability without subscription fees. Though not ideal for professional mechanics, the CR529 is an excellent choice for everyday car owners seeking reliable diagnostics on a budget.
Read our full Launch CR529 review
Best Professional-Level OBD-II Scanner: Topdon Phoenix Lite 2
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(Image credit: Future)](https://target.georiot.com/Proxy.ashx?tsid=45724&GR_URL=https%3A%2F%2Famazon.com%2Fdp%2FB085TG89H4%3Ftag%3Dhawk-future-20%26ascsubtag%3Dtomsguide-us-1224700782076728613-20)
3. Topdon Phoenix Lite 2
Bridging the Gap Between DIY and Professional Automotive Diagnostics
Read our expert review
Specifications:
- Display/Size: Color/8-inch
- Bluetooth/Handheld: Yes/Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: Touchscreen
- 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
- Versatile handheld with Wi-Fi and Bluetooth
- Large 8-inch touchscreen interface
- Extensive diagnostic tests and live data options
- Includes adapters and protective hard case
Reasons to Avoid:
- Bulky and heavy design
- Higher price point
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 justifies its premium price with near-professional diagnostic capabilities, appealing to both experienced mechanics and dedicated car enthusiasts. Its wireless design, featuring a Bluetooth-connected control pad, offers exceptional mobility around the vehicle. While substantial in size, it includes a kickstand and robust construction suited for workshop environments. Advanced features like live data graphing and detailed fault information are standard. Note that firmware updates require a yearly subscription after the initial two years.
Read our full Topdon Phoenix Lite 2 review
Best Dual-Purpose OBD-II Scanner: Ancel BD310
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
An OBD-II Scanner That Doubles as a Car Performance Display
Read our expert review
Specifications:
- Display/Size: Color/2 inches
- Bluetooth/Handheld: Yes/Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: 4
- Warranty: 3 years
- Size: 5.1 x 2.4 x 0.6 inches
- Weight: 5.4 ounces
Reasons to Buy:
- Lightweight and compact for portability
- Functions as both a scanner and a secondary car display
- Offers handheld and Bluetooth scanning options
Reasons to Avoid:
- Minimalist interface design
- Small screen size
The Ancel BD310 offers dual functionality as a standard handheld OBD-II scanner and a Bluetooth-connected device capable of displaying key engine metrics directly in your car. Its compact and lightweight design makes it easy to store in a glovebox. While the 2-inch screen and simplified four-button interface are basic, they suffice for essential diagnostics. The 56-inch cable provides ample reach, and it supports crucial functions like I/M readiness tests and displaying real-time performance data, including coolant temperature, engine timing, and RPM.
Read our full Ancel BD310 review.
Best OBD-II Scanner with Companion App: Carly OBD-II Scanner
(Image credit: Carly)
5. Carly OBD-II Scanner
Maximize Your Scanner’s Potential with the Right Vehicle and App
Read our expert review
Specifications:
- Display/Size: No
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: No
- Live Data Display: Yes
- Number of Keys: None
- 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
- Real-time live data display
- Maintenance and repair assistance
- Lifetime warranty and updates
Reasons to Avoid:
- Feature availability varies by car model
- App subscription can be costly
The Carly OBD-II Scanner excels with its exceptional companion app, offering a significantly enhanced user experience compared to basic Bluetooth scanner apps. Beyond fault diagnosis, it provides repair guidance and used car check functionalities. A lifetime warranty adds considerable value. However, feature compatibility varies across car models, and accessing advanced features requires a subscription, which can increase the overall cost. It’s essential to verify compatibility with your specific vehicle to fully leverage Carly’s capabilities.
Read our full Carly OBD scanner review
Other OBD-II Scanners We’ve Tested
Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a standout Bluetooth OBD-II scanner, inheriting Innova’s renowned features like predictive diagnostics in a wireless format. Its straightforward setup process further enhances its appeal as a Bluetooth-only option.
Read the full Innova CarScan Mobile 1000 review
ThinkCar ThinkDiag TKD01 (★★★★☆)
Despite its larger size for a Bluetooth OBD-II scanner, the ThinkCar ThinkDiag TKD01 boasts exceptional durability. It offers extensive manufacturer-specific error codes and advanced fault-code diagnostics that can resolve minor issues without mechanical intervention. A subscription fee applies after the first year.
Read our full ThinkCar ThinkDiag TKD01 review.
Autel AutoLink AL539 (★★★☆☆)
The Autel AutoLink AL539 excels in diagnosing electrical problems, featuring a built-in multimeter for identifying issues like damaged cables, shorts, and blown fuses. It also provides a wide range of 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 access information from a vehicle’s onboard computer via the OBD port. These scanners can read and interpret error codes, monitor real-time vehicle system data, and even predict potential future issues. They are crucial for diagnosing car problems efficiently.
What is the OBD-II Port?
The On-Board Diagnostics Version Two (OBD-II) port is a standardized interface found in almost all cars sold in the US since 1996, and later in other regions. It serves as the connection point for devices like OBD-II scanners, telematics devices, and dashcams to communicate with the car’s computer system. Locate your car’s OBD-II port using online guides.
What is a DTC?
DTC stands for Diagnostic Trouble Code. These are error codes generated by a car’s OBD system when it detects a problem. OBD-II scanners read these codes to help users understand the nature of the issue. Standardized DTCs are common across vehicles, but some manufacturers also use proprietary codes.
Understanding DTC Meanings:
DTCs may seem cryptic, but they follow a logical structure. The first character indicates the affected system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character is ‘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: Speed control and idle control
- 6: Computer auxiliary outputs
- 7, 8, 9: Transmission/gearbox faults
- A, B, C: Hybrid propulsion faults
The final two characters pinpoint the exact fault. While OBD-II scanners provide code definitions, further research on Google might be needed for in-depth understanding. With over 5,000 possible DTCs, not all indicate critical problems; some may signal minor issues like slightly elevated engine temperature.
Choosing the Right OBD-II Scanner: Key Considerations
Using a best OBDII scanner is the most effective way to understand your vehicle’s health and diagnose problems. These scanners are the same tools professionals use. OBD-II scanners come in two main types:
Handheld OBD-II Scanners: These units have an integrated screen and connect directly to the OBD port via a cable.
Wireless OBD-II Scanners: These plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for data display.
High-quality OBD-II scanners are available across different price points. Key factors to consider when selecting a scanner include:
- Easy Setup: A straightforward setup process is crucial for quick diagnostics.
- Fault Explanation: Scanners should not only display fault codes but also provide clear explanations.
- I/M Readiness Check: Essential for emissions test readiness verification.
- Accuracy: Reliable and accurate readings are paramount for effective diagnosis.
- Size and Weight: Portability ensures the scanner is readily available when needed.
- Live Data: Real-time data monitoring is vital for tracking intermittent issues.
- Graphs: Visual data representation enhances analysis and comparison.
- Warranty: Long-term warranty and software updates ensure lasting value.
Deciding between a handheld or wireless scanner depends on personal preference. Consider features like screen size, ruggedness, and extra functionalities like multimeters or PDF export capabilities. The value offered by OBD-II scanners, especially given their cost relative to mechanic labor rates, makes them a worthwhile investment for informed car maintenance.
Our OBD-II Scanner Testing Methodology
To evaluate OBD-II scanners, we conducted hands-on testing using a 2014 Audi A4 Allroad over several weeks. Each scanner was connected to the vehicle’s OBD-II port to verify VIN reporting. Wireless scanners were paired with devices like Apple iPads, Microsoft Surfaces, and Samsung Galaxy phones via Bluetooth or Wi-Fi. Handheld scanners were tested by direct OBD-II port connection.
We assessed cable length for handheld units and wireless range for Bluetooth models. With the engine running, we monitored system data and simulated a fault by disconnecting the oil temperature sensor. We then evaluated the scanner’s ability to report the fault, clear the error code, and display live operating data in various formats (numbers, graphs, gauges) during road tests.
Our testing also focused on understanding the fault code structure, which includes a letter prefix (P, B, C, U) and numeric codes. Generic codes (starting with ‘0’) and manufacturer-specific codes (starting with ‘1’) were examined to understand the level of detail provided by each scanner. For example, a P0098 code (generic intake air temperature sensor issue) versus a Ford-specific P1112 code (intake air temperature sensor intermittent issue) highlights the diagnostic depth of different scanners.
More Resources From Tom’s Guide
Explore more automotive technology insights and reviews on Tom’s Guide for comprehensive information on vehicle maintenance and diagnostics.
