Your car’s dashboard just lit up with a mysterious light, or maybe you’re just keen to understand what’s happening under the hood. The key to unlocking these automotive secrets is a Good Obd2 Scanner. This device acts as a communicator, plugging into your car’s onboard computer to provide insights into its health and performance. Instead of immediately rushing to a mechanic and facing potentially hefty bills, an OBD2 scanner empowers you to diagnose problems yourself.
However, the world of OBD2 scanners can be overwhelming. With countless options available, finding a good OBD2 scanner that meets your needs and budget can feel like navigating a maze. We’ve spent years testing a wide range of OBD2 scanners, from basic models to professional-grade tools. This hands-on experience allows us to guide you through the best choices and help you understand how these scanners work and what those cryptic error codes actually mean.
Whether you’re a seasoned DIY mechanic or a first-time car owner, this guide will help you find the good OBD2 scanner that’s right for you. We’ve compiled a list of top recommendations, followed by in-depth reviews and essential information to make your decision easier.
Here are our top picks for the best OBD2 scanners you can buy right now, catering to different needs and budgets.
The Quick List: Best OBD2 Scanners at a Glance
For those in a hurry, here’s a quick rundown of our recommended good OBD2 scanners. Scroll down for detailed reviews and buying advice.
[](best mobile scanner)
1. Topdon TopScan: Best Mobile OBD2 Scanner
This wireless scanner is incredibly easy to use and packed with professional-level features in a compact design. It offers comprehensive diagnostics, repair guidance, parts lists, and even predictive analysis to anticipate potential issues.
[](best cheap scanner)
2. Launch CR529: Best Budget-Friendly OBD2 Scanner
Priced affordably, the Launch CR529 delivers exceptional value. It provides essential OBD2 functions along with some advanced features typically found in more expensive scanners. Lifetime updates and support further enhance its value.
[](best rugged scanner)
3. Topdon Phoenix Lite 2: Best Professional-Grade OBD2 Scanner
Combining ruggedness with advanced capabilities, the Topdon Phoenix Lite 2 is ideal for both professionals and serious DIYers. Its tablet-like design, comprehensive features, and robust build quality justify its higher price tag.
[](best dual-purpose scanner)
4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
The Ancel BD310 stands out with its dual functionality. It serves as a standard OBD2 scanner and can also display real-time engine data on your dashboard, offering added convenience and insight.
[](best scanner with a companion app)
5. Carly OBD-II Scanner: Best OBD2 Scanner with Companion App
The Carly OBD-II Scanner shines with its exceptional companion app. Depending on your car make (especially VW, BMW, and Ford), it offers extensive customization, advanced diagnostics, and user-friendly features.
What Makes a Good OBD2 Scanner?
At Tom’s Guide, we rigorously test and evaluate products to help you make informed decisions. When it comes to OBD2 scanners, we understand the importance of accuracy, ease of use, and features. Learn more about our rigorous testing process.
Best Mobile OBD2 Scanner
(Image credit: Topdon)
1. Topdon TopScan
Perfect for Deep Dive Diagnostics on the Go
Read our expert review
Specifications:
- Display/size: None (App-based)
- Bluetooth/handheld: Yes/No
- I/M Readiness test: Yes
- Displays live data: Yes
- Number of keys: None (App-based)
- Warranty: 2 year
- Size: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Excellent and extensive vehicle diagnostic coverage
- Provides live data streams for real-time monitoring
- Unique performance indicators for vehicle assessment
- Covers a wide range of maintenance items
Reasons to Avoid:
- The wireless transmitter is relatively large
- Some advanced features require a subscription after the first year
Don’t let its small size fool you; the Topdon TopScan is a surprisingly powerful and good OBD2 scanner. This Bluetooth-enabled device goes beyond basic error code reading. We were impressed by its ability to delve into your car’s performance and efficiency. It can estimate horsepower and torque, features rarely found in scanners in this price range, or even significantly more expensive ones.
Beyond standard fault finding and I/M Readiness tests, the TopScan offers features for performance tuning and ensuring your car is in top condition. If you want a portable, feature-rich good OBD2 scanner that can provide in-depth insights, the Topdon TopScan is an excellent choice for your toolbox.
Read our full Topdon TopScan review
Best Budget-Friendly OBD2 Scanner
(Image credit: Future)
2. Launch CR529
Unbeatable Value for Under $50
Read our expert review
Specifications:
- Display/size: Color/ 2.8-inches
- Bluetooth/handheld: No/Yes
- I/M Readiness test: Yes
- Displays live data: Yes
- Number of keys: 8
- Warranty: 1 year
- Size: 6.5 x 3.8 x 1.2 inches
- Weight: 11 ounces
Reasons to Buy:
- Very inexpensive and accessible
- Offers lifetime free updates for extended usability
- Provides an easy-to-use pre-inspection report feature
Reasons to Avoid:
- Does not support manufacturer-specific specialty codes
- Feels somewhat heavy for its size
- Comes with a limited 1-year warranty
The Launch CR529 redefines “value” in the world of OBD2 scanners. For its incredibly low price, it delivers a surprising array of diagnostic features, making it a good OBD2 scanner for budget-conscious users. We were astonished by the level of functionality packed into such an affordable device.
While compromises are expected at this price point, such as the lack of manufacturer-specific codes and a slightly bulky feel, the CR529 still provides live data, instant inspection reports, and a detailed look into your car’s systems. The inclusion of lifetime updates is a significant bonus, ensuring long-term usability without subscription fees.
For everyday car owners who need a reliable and good OBD2 scanner for basic diagnostics without breaking the bank, the Launch CR529 is hard to beat. While it might not satisfy professional mechanics, it’s an excellent tool for the average driver to keep in their car.
Read our full Launch CR529 review
Best Professional-Grade OBD2 Scanner
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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-6624740130487362149-20)
3. Topdon Phoenix Lite 2
Bridging the Gap Between Amateur and Professional Diagnostics
Read our expert review
Specifications:
- Display/size: Color/8-inch
- Bluetooth/handheld: Yes/Yes
- I/M Readiness test: Yes
- Displays live data: 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:
- Offers near-professional level OBD scanning capabilities
- Combines handheld convenience with Wi-Fi and Bluetooth connectivity
- Features a large and user-friendly 8-inch touchscreen display
- Provides an excellent array of diagnostic tests and live data graphing
- Includes a variety of adapters and a hard protective case
Reasons to Avoid:
- Bulky, heavy, and can be cumbersome to handle at times
- Represents a significant financial investment
- Requires a subscription after two years for continued updates
The Topdon Phoenix Lite 2 is a serious tool for serious car diagnostics. While it comes with a higher price tag than many other OBD2 scanners, it delivers a wealth of features that justify the cost, particularly if you need a truly good OBD2 scanner for comprehensive analysis. It effectively blurs the lines between amateur and professional-level diagnostic tools.
Its wireless design, with a Bluetooth-connected control pad, offers exceptional freedom of movement around the vehicle. The rugged construction and included kickstand are ideal for workshop environments. Beyond basic error codes, the Phoenix Lite 2 excels with live data graphing and advanced diagnostic functions that are typically absent in cheaper scanners. While the subscription cost after two years is a factor to consider, the initial investment provides two years of firmware updates and a highly capable good OBD2 scanner.
Read our full Topdon Phoenix 2 Lite review
Best Dual-Purpose OBD2 Scanner
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
An OBD2 Scanner That Does Double Duty
Read our expert review
Specifications:
- Display/size: Color/2 inches
- Bluetooth/handheld: Yes/Yes
- I/M Readiness test: Yes
- Displays live data: 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 highly compact for easy storage
- Functions as both an OBD2 scanner and a secondary car display
- Offers both handheld and Bluetooth scanning options for versatility
Reasons to Avoid:
- The user interface is quite minimalist in design
- The built-in screen is relatively small
The Ancel BD310 offers a unique proposition: it’s not just a good OBD2 scanner, but also a supplementary display for your car’s vital statistics. This dual functionality sets it apart. It can operate as a standard handheld scanner or connect to your smartphone via Bluetooth, and in its display mode, it can show real-time engine data directly in your car cabin.
Its compact and lightweight design makes it incredibly convenient to keep in your glovebox. While the 2-inch screen is small and the four-key interface is somewhat basic, these design choices contribute to its portability. The 56-inch cable offers ample reach, and the BD310 performs essential OBD2 functions like I/M readiness tests and displaying performance data like coolant temperature, engine timing, and speed. For those who value convenience and dual functionality in a good OBD2 scanner, the Ancel BD310 is a compelling option.
Read our full Ancel BD310 review.
Best OBD2 Scanner with Companion App
(Image credit: Carly)
5. Carly OBD-II Scanner
Unlock Advanced Features with an Exceptional App
Read our expert review
Specifications:
- Display/Size: No (App-based)
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: No
- Displays live data: Yes
- Number of keys: None (App-based)
- Warranty: Lifetime
- Size: 2.9 x 1.5 x 0.7 inches
- Weight: 0.7 ounces
Reasons to Buy:
- Features an exceptionally easy-to-use app interface
- Offers extensive customization options for advanced users
- Displays live data streams for real-time monitoring
- Covers maintenance and repair procedures within the app
- Comes with a lifetime warranty and software updates
Reasons to Avoid:
- Feature availability varies significantly depending on car model
- The app subscription can become expensive for full functionality
The Carly OBD Scanner stands out because of its outstanding companion app. While many Bluetooth OBD2 scanners have basic apps, Carly offers one of the most sophisticated and user-friendly app experiences we’ve encountered, making it a truly good OBD2 scanner when paired with the right vehicle.
Beyond basic diagnostics and clearing fault codes, the Carly app provides repair assistance, used car checks, and extensive customization options. The lifetime warranty is a rare and valuable benefit. However, the feature set is heavily dependent on your car’s make and model, with VW, BMW, and Ford vehicles benefiting the most. Also, accessing the full potential of the app requires an ongoing subscription, which can add to the overall cost.
Read our full Carly OBD scanner review
Other Good OBD2 Scanners We’ve Tested
These scanners might not have made our top picks, but they are still good OBD2 scanner options worth considering:
- Innova CarScan Mobile 1000 (★★★★☆): This Bluetooth scanner is packed with Innova’s renowned features, including predictive diagnostics. Its wireless design and simple setup make it a compelling Bluetooth-only choice. Read the full Innova CarScan Mobile 1000 review
- ThinkCar ThinkDiag TKD01 (★★★★☆): While larger than some Bluetooth scanners, the TKD01 is built to last. It offers a wide range of manufacturer-specific codes and extended fault code functionality, potentially fixing minor issues without mechanic intervention. A subscription is required after the first year. Read our full ThinkCar ThinkDiag TKD01 review.
- Autel AutoLink AL539 (★★★☆☆): Designed for electrical diagnostics, this scanner includes a built-in multimeter to help identify electrical issues like shorts and blown fuses. It also provides extensive live data and pre-inspection readiness checks. Read our full Autel AutoLink AL539 review
Frequently Asked Questions About OBD2 Scanners
What exactly is an OBD2 Scanner?
Mechanics use OBD2 scanners to diagnose car problems by accessing your car’s onboard computer via the OBD port. These scanners read error codes and provide real-time data about your vehicle’s systems. More advanced good OBD2 scanners 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 nearly all passenger vehicles sold in the US since 1996, Canada since 1998, the EU since 2004, and other regions like Australia and Mexico. It’s the interface point for OBD2 scanners and other devices like insurance trackers and dashcams.
If you’re unsure of its location, you can easily find your car’s OBD2 port in North American vehicles or locate your OBD2/EOBD port worldwide.
What is a DTC?
DTC stands for Diagnostic Trouble Code. It’s the error code generated by your car’s OBD system when it detects a problem. OBD2 scanners read these codes, allowing users to understand the nature of the issue. While many DTCs are standardized across car brands, some manufacturers use unique, proprietary codes.
What do DTCs actually mean?
DTCs appear as a combination of letters and numbers that may seem cryptic at first. However, they follow a logical structure to indicate the system and nature of the problem.
- The first letter 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 indicates a generic, standardized code
- 1 indicates a manufacturer-specific code
- 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 control
- 5: Vehicle speed and idle control
- 6: Computer output circuits
- 7, 8, 9: Transmission/gearbox
- A, B, C: Hybrid propulsion system
The fourth and fifth characters are numbers from 0 to 99, providing further detail about the specific fault. Good OBD2 scanners will translate these codes into understandable descriptions. While some online resources like Google can help decode DTCs, advanced scanners offer more comprehensive information. It’s worth noting that there are thousands of possible DTCs, but not all indicate critical problems; some may simply signal minor issues like a slightly elevated engine temperature.
How to Choose the Best Good OBD2 Scanner for You
Using a good OBD2 scanner is the best way to understand your vehicle’s health and diagnose issues. It’s the same technology used by dealerships and mechanics, putting diagnostic power in your hands. When choosing an OBD2 scanner, consider these factors:
There are two main types of OBD2 scanners:
- Handheld OBD2 scanners: These come with their own display screen and connect to your car via a cable.
- Wireless OBD2 scanners: These plug into your OBD port and connect wirelessly via Bluetooth to your smartphone or tablet.
Both types offer high-performance options under $200, and even budget-friendly options under $30. The key is finding the good OBD2 scanner that balances ease of use, features, and accuracy. Here are crucial criteria:
- Easy Setup: A good OBD2 scanner should be quick and easy to set up, so you’ll use it promptly when issues arise.
- Faults and Explanations: The scanner should not only identify fault codes but also provide clear explanations to help you understand the problem and decide on repair actions.
- I/M Readiness Check: Essential for emissions testing, this feature verifies if your car will pass state inspections.
- Accuracy: Accurate readings are paramount. Incorrect information is worse than no information at all. A good OBD2 scanner provides reliable data.
- 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 data streams of engine parameters are invaluable for diagnosing intermittent issues.
- Graphs: Visual data representation, especially graphs, makes it easier to analyze trends and compare data over time.
- Warranty: Look for scanners with a solid warranty, ideally lifetime, reflecting the expected lifespan of the device.
When selecting a good OBD2 scanner, decide if you prefer the convenience of a wireless scanner that uses your phone or tablet, or a handheld unit with its own screen. Consider long-term value by choosing a scanner with lifetime updates or a strong warranty to ensure it remains compatible with evolving automotive technology.
For handheld scanners, prioritize screen size and clarity. A large, bright, icon-based display enhances usability. If durability is a concern, consider ruggedized scanners with shock-absorbing bumpers. Some good OBD2 scanners offer extra features like built-in multimeters, manufacturer-specific code reading, and PDF report exporting.
Ultimately, even sophisticated good OBD2 scanners are available at surprisingly affordable prices, often under $100. This is a small investment compared to even an hour of mechanic labor, making it a worthwhile tool for any car owner.
How We Test OBD2 Scanners
To ensure we recommend only the good OBD2 scanners, we conduct thorough testing. Our testing process involves using a 2014 Audi A4 Allroad over several weeks, both in the garage and on the road.
We begin by verifying each scanner’s ability to correctly identify the car’s Vehicle Identification Number (VIN). For wireless scanners, we test connectivity with various devices, including Apple iPads, Microsoft Surfaces, and Samsung Galaxy phones, via Bluetooth or Wi-Fi. Handheld scanners are tested by simply plugging them into the OBD2 port, which provides power.
We evaluate cord length on handheld scanners and wireless range on Bluetooth models. With the car running, we monitor engine and vital systems. To simulate a fault, we disconnect the engine’s oil temperature sensor.
We then assess the detail and accuracy of the fault codes and explanations provided by each scanner. After diagnosing the simulated issue, we use the scanner to clear the fault code and turn off the check engine light.
Finally, we road-test the scanners to evaluate their ability to display real-time operating data, such as engine speed, timing, and coolant temperature. We note whether data is presented numerically, graphically, or as simulated gauges.
Our testing emphasizes real-world scenarios to ensure that our recommended good OBD2 scanners are reliable, accurate, and user-friendly.
Understanding DTC codes is key to using OBD2 scanners effectively. Remember the basic structure: a letter prefix (P, B, C, or U) followed by five numbers. Generic codes (starting with 0) are common across all makes, while manufacturer-specific codes (starting with 1) are unique to certain brands and may offer more detailed diagnostics. For example, a P0098 code generally indicates an issue with the intake air temperature sensor, while a Ford-specific P1112 code points to an intermittent intake air temperature sensor reading, suggesting replacement is needed.
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