Modern cars are complex machines packed with onboard computers that constantly monitor their health. When something goes wrong, or even before a minor issue escalates, your car’s computer often knows about it. An OBD2 scanner acts as your personal automotive interpreter, connecting to this computer and translating the technical jargon into understandable information. This empowers you to diagnose car problems yourself, potentially saving money on expensive mechanic visits.
However, the world of OBD2 scanners can be overwhelming, especially for beginners. With countless options available, finding the right one can feel like navigating a maze. Fortunately, we’ve rigorously tested a wide array of OBD2 scanners over the years, and we’re here to guide you to the best choices. Below, we’ll delve into our top recommendations and explain how OBD2 scanners work and what those cryptic error codes actually mean.
Our top picks include the Topdon TopScan, a remarkably user-friendly wireless scanner packed with features. For budget-conscious users, the Launch CR529 offers exceptional value at an affordable price. And for those seeking a professional-grade diagnostic experience, the Topdon Phoenix Lite 2 delivers advanced capabilities, though it comes with a higher price tag.
Here’s our curated list of the best OBD2 scanners you can buy right now, based on our hands-on testing. Keep scrolling for detailed reviews and insights into each model and what makes them stand out.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, covering everything from the latest smartphones to essential mobile apps. He’s also a passionate advocate for electric vehicles and a keen observer of the automotive tech world.
The Best OBD2 Scanners at a Glance
Here are the top OBD2 scanners available today, chosen after extensive hands-on testing. Continue reading for in-depth reviews and to understand what makes each of these scanners excel.
1. Topdon TopScan – Best Mobile Scanner
Effortless Bluetooth setup combined with professional-level features in a compact design. Expect comprehensive diagnostics, repair guidance, parts lists, and even predictive analysis for potential issues.
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2. Launch CR529 – Best Cheap Scanner
Compact yet powerful, the Launch CR529 provides essential OBD2 scanner functions along with premium features often absent in similarly priced competitors. Lifetime support and updates add exceptional value.
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3. Topdon Phoenix Lite 2 – Best Rugged Scanner
This robust scanner, reminiscent of a Nintendo Switch in its design, is built for both professionals and car enthusiasts. It’s a powerful, durable option for those needing a scanner that can withstand demanding environments.
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4. Ancel BD310 – Best Dual-Purpose Scanner
Beyond OBD2 scanning, the Ancel BD310 enhances your dashboard with real-time engine specifications. It features a sleek design, smartphone compatibility, and a reasonable price point.
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5. Carly OBD-II Scanner – Best Scanner with a Companion App
Carly’s utility is highly dependent on your car’s make, with optimal functionality for VW, BMW, and Ford. It boasts a top-tier companion app offering extensive customization and professional-grade testing.
Deep Dive into the Best OBD2 Scanners
Why Trust Tom’s Guide? At Tom’s Guide, our team of expert reviewers dedicate countless hours to hands-on testing and analysis of products, apps, and services to bring you reliable and insightful recommendations. Learn more about our rigorous testing methodology.
Best Mobile OBD2 Scanner
(Image credit: Topdon)
1. Topdon TopScan
Perfect for In-Depth Vehicle Diagnostics
Read our expert review:
Specifications:
| Feature | Specification |
|---|---|
| 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 features
Reasons to Avoid:
- Relatively large and heavy transmitter
- Some advanced features require a subscription after the first year
The Topdon TopScan might appear unassuming at first glance, but this compact OBD2 scanner is a powerhouse of features. It’s more than just a standard Bluetooth OBD2 module; it significantly surpasses the capabilities of its competitors in the same class.
Beyond basic fault detection and I/M Readiness tests, the TopScan excels in performance and efficiency analysis. It can even estimate your vehicle’s horsepower and torque – features rarely found in scanners at this price point, or even those costing ten times more. Whether you’re looking to optimize your car’s performance or ensure its roadworthiness, the TopScan is an invaluable tool for your garage.
Read our full Topdon TopScan review
Best Cheap OBD2 Scanner
(Image credit: Future)
2. Launch CR529
Unbeatable OBD2 Scanning Value Under $50
Read our expert review:
Specifications:
| Feature | Specification |
|---|---|
| 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:
- Extremely affordable
- Lifetime free updates
- Easy pre-inspection reporting
Reasons to Avoid:
- Lacks manufacturer-specific specialty codes
- Feels somewhat heavy
- Shorter 1-year warranty
The Launch CR529 is arguably the best value OBD2 scanner on the market. Its remarkably low price of around $40 belies the extensive diagnostic features it offers. The level of functionality you get for such a minimal investment is truly impressive.
While compromises are inevitable at this price point, such as the absence of manufacturer specialty codes and a slightly heavy feel, the CR529 still delivers essential features. It provides live data, an instant inspection function, and surprisingly detailed insights into your car’s inner workings. The inclusion of lifetime updates further enhances its long-term value, eliminating the need for subscriptions.
While the CR529 might not satisfy professional mechanics seeking advanced features, it’s an excellent choice for everyday car owners and DIY enthusiasts looking for a reliable and budget-friendly OBD2 scanner.
Read our full Launch CR529 review
Best Pro-Level OBD2 Scanner
(Image credit: Future)
3. Topdon Phoenix Lite 2
Bridging the Gap Between Amateur and Professional Diagnostics
Read our expert review:
Specifications:
| Feature | Specification |
|---|---|
| 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 connectivity
- Large 8-inch touchscreen display
- Extensive array of diagnostic tests and live data options
- Includes adapters and a hard protective case
Reasons to Avoid:
- Bulky, heavy, and can be cumbersome
- Significant upfront cost
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 represents a significant investment, costing considerably more than many other capable OBD2 scanners. However, it delivers exceptional value for its price, offering features that cater to both experienced mechanics and serious DIY enthusiasts.
A standout feature is its wireless operation. The control pad connects via Bluetooth to a receiver plugged into the OBD port, providing unparalleled freedom of movement around the vehicle. While the scanner itself is large and heavy, it features a built-in kickstand and a rugged design to withstand workshop conditions.
The Phoenix Lite 2 offers advanced features like live data graphing, detailed fault code information, and capabilities that surpass most budget-friendly scanners. It’s important to note that firmware updates are included for two years, after which a $495 annual subscription is required.
Read our full Topdon Phoenix 2 Lite review
Best Dual-Purpose OBD2 Scanner
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
A Versatile OBD2 Scanner That Doubles as a Car Display
Read our expert review:
Specifications:
| Feature | Specification |
|---|---|
| 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 design
- Functions as both a scanner and a secondary car display
- Offers handheld and Bluetooth scanning options
Reasons to Avoid:
- Minimalist interface might feel basic
- Small 2-inch screen
The Ancel BD310 offers dual functionality, serving as both a traditional handheld OBD2 scanner and a Bluetooth-connected device. Furthermore, it can transform into a secondary display within your car, showing crucial engine parameters in real-time.
Its compact and lightweight design makes the BD310 incredibly portable; it easily fits in a glovebox. While the 2-inch screen is small and the four-button interface is somewhat basic, these factors don’t significantly hinder its diagnostic capabilities.
The 56-inch cable provides ample reach while working under the hood, and the BD310 performs essential functions like I/M readiness tests and displays performance data, including coolant temperature, engine timing, and engine speed.
Read our full Ancel BD310 review.
Best Companion App for OBD2 Scanning
(Image credit: Carly)
5. Carly OBD-II Scanner
A Capable Scanner, But Its Value Depends on Your Car
Read our expert review:
Specifications:
| Feature | Specification |
|---|---|
| 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 and intuitive app interface
- Extensive customization options
- Live data display
- Covers maintenance and repair procedures
- Lifetime warranty and updates
Reasons to Avoid:
- Feature availability varies significantly across car models
- App subscriptions can become expensive
The Carly OBD Scanner stands out for its exceptional companion app. While many Bluetooth OBD2 scanners offer basic apps, Carly provides one of the most feature-rich and user-friendly app experiences we’ve encountered.
Beyond diagnosing issues and clearing fault codes, the Carly app offers repair assistance, helping you get your car back on the road. It also includes tools for pre-purchase used car inspections, helping you avoid buying a problematic vehicle. The lifetime warranty is a significant and rare benefit.
However, the functionality of the Carly scanner is heavily dependent on your car’s make and model. It’s essential to verify compatibility before purchasing, as not all features are available for every vehicle. Additionally, accessing advanced features beyond basic OBD functions requires an ongoing subscription, which can add to the overall cost.
Read our full Carly OBD scanner review
Other OBD2 Scanners We’ve Tested
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Innova CarScan Mobile 1000 (★★★★☆): A highly innovative Bluetooth OBD2 scanner from Innova, offering features like predictive diagnostics in a wireless format. It’s incredibly easy to set up and use.
- Read the full Innova CarScan Mobile 1000 review
-
ThinkCar ThinkDiag TKD01 (★★★★☆): While larger than some Bluetooth OBD2 scanners, the TKD01 is exceptionally durable. It boasts a wide range of manufacturer-specific error codes and extended fault-code capabilities that can resolve minor issues without professional help. A subscription is required after the first year.
- Read our full ThinkCar ThinkDiag TKD01 review.
-
Autel AutoLink AL539 (★★★☆☆): Specifically designed for diagnosing electrical problems, this OBD2 scanner includes a built-in multimeter for identifying issues like burnt cables, shorts, and blown fuses. It also offers extensive live data and pre-inspection readiness checks.
- Read our full Autel AutoLink AL539 review
Frequently Asked Questions About OBD2 Scanners
What is an OBD2 Scanner?
OBD2 scanners are diagnostic tools that mechanics and car owners use to understand a vehicle’s health. Instead of manually inspecting every component, they connect a scanner to the car’s OBD port to access data from the onboard computer.
At their most basic, OBD2 scanners read and interpret error codes generated by your car when it detects a problem. More advanced scanners offer real-time monitoring of vehicle systems and can even predict potential future issues.
What is the OBD2 Port?
The On-Board Diagnostics Version Two (OBD2) port is a standardized connector found in almost all passenger vehicles sold in the United States since 1996, Canada since 1998, the European Union since 2004, and Australia, Mexico, and New Zealand since 2006.
This port serves as the interface to your car’s onboard computer. Various devices can connect to the OBD2 port, including OBD2 scanners, insurance telematics devices, and even dashcams.
If you’re unsure about the location of your OBD2 port, here’s a guide to find your car’s OBD2 port in North American vehicles. For locations worldwide, refer to this guide on finding your OBD2/EOBD port globally.
What is a DTC?
DTC stands for Diagnostic Trouble Code. These are error codes generated by a car’s OBD system when it identifies a problem. OBD2 scanners read these codes, allowing users to diagnose issues under the hood. Standardized DTC codes are common across vehicle makes and models, although some manufacturers use proprietary DTCs specific to their vehicles.
What Do DTCs Actually Mean?
DTCs might seem like random alphanumeric strings, but they follow a logical structure that can help you understand the nature of the detected error.
The first character is a letter indicating the affected vehicle system:
- P – Powertrain (engine, transmission)
- B – Body (interior, comfort, safety systems)
- C – Chassis (braking, steering, suspension)
- N – Network (communication systems)
The second character is a number: 0 for a generic code (standard across manufacturers) or 1 for a manufacturer-specific code.
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 control
- 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 fourth and fifth characters pinpoint the exact fault, ranging from 0 to 99.
OBD2 scanners translate these codes into descriptive messages. Advanced models provide more detailed explanations, but online resources like Google can also help decipher DTCs. While there are over 5,000 possible DTCs, not all indicate critical problems. Some may simply flag minor issues like a slightly elevated engine temperature.
Choosing the Right OBD2 Scanner for Your Needs
If you’re seeking deeper insights into your vehicle’s operation or troubleshooting a check engine light, an OBD2 scanner is an invaluable tool. It provides access to the same diagnostic information used by dealerships and repair shops.
There are two primary types of OBD2 scanners:
- Handheld OBD2 scanners: These units have their own display and connect directly to the car’s OBD port via a cable.
- Wireless OBD2 scanners: These plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for displaying data.
High-quality OBD2 scanners are available for under $200, and basic models can cost less than $30. Key factors to consider when choosing an OBD2 scanner include:
- Easy Setup: A scanner should be quick and straightforward to set up for efficient diagnostics.
- Fault Code Explanation: The best scanners not only display fault codes but also provide clear explanations to help you understand the issue and decide on a course of action (DIY repair or professional mechanic).
- I/M Readiness Check: A valuable feature for emissions testing, this function verifies if your car will pass a state inspection.
- Accuracy: Accurate readings are crucial; unreliable data is worse than no data at all.
- Size and Weight: A compact and lightweight scanner is more likely to be kept in your car for on-the-go diagnostics.
- Live Data: Real-time monitoring of engine parameters helps diagnose intermittent problems.
- Data Graphs: Visual data representation through graphs enhances understanding and comparison over time.
- Warranty: Consider scanners with longer warranties, ideally lifetime warranties, for long-term reliability.
When selecting an OBD2 scanner, decide whether you prefer a standalone handheld unit or a wireless model that uses your smartphone. Look for features like lifetime updates to ensure compatibility with newer vehicles and technologies. For handheld scanners, prioritize screen size and clarity. Rugged designs with rubber bumpers are beneficial for durability in workshop environments.
Extra features like built-in multimeters, manufacturer-specific code reading, and PDF report exporting can add further value. The affordability of even advanced OBD2 scanners makes them a worthwhile investment, often costing less than an hour of professional mechanic labor.
How We Test OBD2 Scanners
To evaluate OBD2 scanners, we conduct hands-on testing using a 2014 Audi A4 Allroad over several weeks, both in a garage setting and during regular driving. For each scanner, we verify its ability to correctly identify the car’s Vehicle Identification Number (VIN) after connecting to the OBD2 port.
For wireless scanners, we test connectivity with various devices, including an Apple iPad Pro, Microsoft Surface, and Samsung Galaxy S9+. Handheld scanners are tested by direct connection to the OBD2 port.
We assess the cable length of handheld scanners and the wireless range of Bluetooth models. With the car running, we monitor engine and vital systems. To simulate a fault, we intentionally disconnect the engine’s oil temperature sensor.
We then evaluate the scanner’s ability to accurately identify and describe the fault code, clear the code after reconnecting the sensor, and turn off the check engine light. Finally, we road-test the scanners, observing their ability to display live operating data like engine speed, timing, and coolant temperature, noting whether data is presented numerically, graphically, or via gauges.
Our testing process ensures a comprehensive evaluation of each OBD2 scanner’s performance, features, and user-friendliness.
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