The Best Obd2 Scanners are essential tools that provide a direct line into your car’s onboard computer, unlocking a wealth of diagnostic information. Whether you’re facing a mysterious dashboard light or suspect a deeper mechanical issue, your vehicle’s computer usually holds the key to understanding what’s happening. An OBD2 scanner acts as the crucial intermediary, empowering you to diagnose problems yourself, potentially saving significant costs on professional mechanic fees.
However, the OBD2 scanner market is diverse, and for newcomers, navigating the options can feel overwhelming. We understand this firsthand. Over years of rigorous testing, we’ve evaluated a wide array of OBD2 scanners, identifying the top performers that are genuinely worth your investment. Below, we present our expert picks. Continue reading to also learn about how OBD2 scanners function and decipher those cryptic error codes.
Among our top recommendations, the Topdon TopScan stands out as a completely wireless and remarkably effective tool for pinpointing car problems. For budget-conscious users, the Launch CR529, priced around $40, offers exceptional value. If you’re seeking near-professional level diagnostics, the Topdon Phoenix Lite 2 delivers an experience akin to what professionals use, though this premium capability comes at a cost of around $799.
Here are our expertly selected top OBD2 scanners available for purchase right now.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, covering the latest in mobile technology and apps. He also has a strong interest in electric vehicles, advocating for their adoption.
Top OBD2 Scanner Picks at a Glance
Based on our extensive hands-on testing, here’s a quick list of the best OBD2 scanners you can buy. Scroll down for detailed reviews of each product and insights into why they excel.
1. Topdon TopScan: Best Mobile OBD2 Scanner
The Topdon TopScan is incredibly user-friendly, offering a straightforward Bluetooth setup combined with a suite of features typically found in professional-grade scanners. Its compact design belies its powerful diagnostic capabilities, providing repair guidance, parts information, and even predictive analysis to anticipate potential issues. Learn More
2. Launch CR529: Best Budget OBD2 Scanner
The Launch CR529 is a compact yet potent OBD2 scanner that delivers essential diagnostic functions and even some advanced features not commonly found in its price range. Coupled with lifetime support and software updates, it represents exceptional value for money. Learn More
3. Topdon Phoenix Lite 2: Best Rugged OBD2 Scanner
Resembling a robust handheld gaming device, the Topdon Phoenix Lite 2 is built for durability and professional use. Beyond its tough exterior, it’s a powerful scanner designed for both experienced mechanics and car enthusiasts seeking advanced diagnostic capabilities in a resilient package. Learn More
4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
The Ancel BD310 is a versatile OBD2 scanner that not only performs diagnostics but can also function as an auxiliary dashboard display, showing real-time engine metrics. Its user-friendly design, smartphone compatibility, and affordable price make it a compelling option. Learn More
5. Carly OBD2 Scanner: Best OBD2 Scanner with Companion App
The Carly OBD2 Scanner’s effectiveness is highly dependent on your car’s make, with brands like VW, BMW, and Ford benefiting most from its core features. However, its standout feature is its exceptional companion app, offering extensive customization and professional-level diagnostic tests. Learn More
Deep Dive: The Best OBD2 Scanners in Detail
Why Trust Tom’s Guide? Our team of expert reviewers dedicates countless hours to testing and analyzing products to provide you with reliable recommendations. Learn more about our rigorous testing methodology.
1. Best Mobile OBD2 Scanner: Topdon TopScan
(Image credit: Topdon)
Topdon TopScan
Unlock Your Car’s Hidden Potential with Deep Diagnostics
Read our comprehensive expert review
Key Specifications:
- Display: None (Uses Smartphone App)
- Connectivity: Bluetooth
- Handheld: No
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: None (App-Based Interface)
- Warranty: 2 Years
- Dimensions: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Extensive vehicle diagnostic coverage
- Real-time live data monitoring
- Unique performance indicators and tests
- Comprehensive maintenance item coverage
Reasons to Avoid:
- Larger transmitter size
- Subscription required for some advanced features after the first year
Don’t let its unassuming appearance fool you; the Topdon TopScan is a powerhouse in a compact package. This isn’t just a basic Bluetooth OBD2 module that streams data to your phone. During testing, we were impressed by its capabilities, which significantly surpass other scanners in its class.
Beyond basic fault code reading and I/M Readiness tests, the TopScan excels in performance and efficiency analysis. It can even estimate your vehicle’s horsepower and torque – features often absent in scanners costing ten times as much. Whether you’re aiming to optimize your car’s performance or simply ensure its roadworthiness, the TopScan is an invaluable addition to your toolkit.
Read our full Topdon TopScan review
2. Best Budget OBD2 Scanner: Launch CR529
(Image credit: Future)
Launch CR529
Unbeatable Value for Money 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
- Dimensions: 6.5 x 3.8 x 1.2 inches
- Weight: 11 ounces
Reasons to Buy:
- Extremely affordable
- Lifetime free updates
- Easy-to-generate pre-inspection reports
Reasons to Avoid:
- Limited manufacturer-specific codes
- Slightly heavy handheld feel
- Shorter 1-year warranty
In our assessment, the Launch CR529 is arguably the best value OBD2 scanner on the market. Its attractive price point of around $38 is just the beginning; the diagnostic capabilities it delivers at this cost are remarkable. We were genuinely surprised by the level of functionality offered for such a minimal investment.
Naturally, some compromises are expected at this price. The CR529 lacks manufacturer-specific diagnostic codes and has a slightly heavier feel. However, it still provides crucial features like live data streaming, instant vehicle inspection reports, and surprisingly detailed insights into your car’s systems. The inclusion of lifetime updates ensures the scanner remains useful and current without any subscription fees.
While the CR529 might not satisfy users with professional automotive diagnostic needs, it’s an excellent choice for the average car owner looking for a reliable and affordable OBD2 scanner for DIY diagnostics.
Read our full Launch CR529 review
3. Best Pro-Level OBD2 Scanner: Topdon Phoenix Lite 2
(Image credit: Future)
Topdon Phoenix Lite 2
Bridging the Gap Between DIY and Professional Diagnostics
Read our expert review
Key Specifications:
- Display: 8-inch Color Touchscreen
- Connectivity: Bluetooth, Wi-Fi
- Handheld: Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: Touchscreen Interface
- Warranty: 2 Years
- Dimensions: 10.2 x 7.2 x 1.7 inches
- Weight: 2.6 pounds
Reasons to Buy:
- Professional-grade OBD scanner features
- Hybrid handheld design with Wi-Fi and Bluetooth
- Large 8-inch touchscreen display
- Extensive range of diagnostic tests and live data parameters
- Includes adapters and a hard carrying case
Reasons to Avoid:
- Bulky, heavy, and can be cumbersome
- Higher price point
- Subscription required for updates after two years
The Topdon Phoenix Lite 2 represents a significant investment compared to other OBD2 scanners, but it delivers exceptional value for its price. It’s designed to cater to both serious DIY enthusiasts and professional mechanics, blurring the lines between amateur and professional diagnostic tools.
A standout feature is its completely wireless operation. The control tablet connects via Bluetooth to a receiver plugged into the OBD port, offering unparalleled freedom of movement around the vehicle. While the scanner itself is substantial in size and weight, it includes a kickstand and rugged construction, making it suitable for demanding workshop environments.
The Phoenix Lite 2 offers advanced capabilities including live data graphing, detailed fault code information, and a host of features typically found only in high-end professional scanners. However, be aware that firmware updates are included for two years, after which a yearly subscription of $495 is required to maintain access to the latest software and features.
Read our full Topdon Phoenix Lite 2 review
4. Best Dual-Purpose OBD2 Scanner: Ancel BD310
(Image credit: Tom’s Guide)
Ancel BD310
OBD2 Scanner and Auxiliary Car Display in One
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
- Dimensions: 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 secondary car display
- Offers handheld and Bluetooth scanning options
Reasons to Avoid:
- Minimalist interface design
- Small screen size
The Ancel BD310 offers a unique dual functionality, operating as a standard handheld OBD2 scanner and, when paired with a smartphone via Bluetooth, as an auxiliary display for your car. This secondary display function can show various real-time engine parameters directly in your vehicle’s cabin.
Its compact and lightweight design makes the BD310 exceptionally portable; it easily fits in a glovebox. The 2-inch screen is admittedly small, and the four-button interface is somewhat basic, but these design choices contribute to its portability and ease of storage without compromising diagnostic functionality.
The 56-inch cable provides ample reach while working under the hood. The BD310 performs essential OBD2 functions effectively, including I/M readiness checks and displaying crucial performance data like coolant temperature, engine timing, and RPM.
Read our full Ancel BD310 review.
5. Best Companion App OBD2 Scanner: Carly OBD2 Scanner
(Image credit: Carly)
Carly OBD2 Scanner
Unlock Advanced Features with a Powerful App, Car Dependent
Read our expert review
Key Specifications:
- Display: None (Uses Smartphone App)
- Connectivity: Bluetooth
- Handheld: No
- I/M Readiness Test: No
- Live Data Display: Yes
- Keys: None (App-Based Interface)
- Warranty: Lifetime
- Dimensions: 2.9 x 1.5 x 0.7 inches
- Weight: 0.7 ounces
Reasons to Buy:
- Intuitive and user-friendly app interface
- Extensive customization options within the app
- Real-time live data display
- Covers maintenance and repair procedures
- Lifetime warranty and software updates
Reasons to Avoid:
- Feature availability varies significantly by car model
- App subscription can become expensive for full functionality
The Carly OBD2 Scanner stands out primarily due to its exceptional companion app. While many Bluetooth scanners offer rudimentary apps, Carly provides one of the most sophisticated and feature-rich app experiences we’ve encountered.
Beyond basic diagnostics and check engine light resets, the Carly app offers repair guides, used car check tools to identify potential issues, and numerous customization options for compatible vehicles. The inclusion of a lifetime warranty is a significant advantage, offering long-term peace of mind.
However, the functionality of the Carly scanner is heavily dependent on your car’s make and model. Certain features are limited or unavailable for some vehicles. While the app is outstanding, accessing advanced features beyond basic OBD2 functions requires an ongoing subscription, which can add to the overall cost. It’s crucial to verify your car’s compatibility with Carly’s features before purchasing.
Read our full Carly OBD scanner review
Other OBD2 Scanners We’ve Tested
Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a highly innovative Bluetooth OBD2 scanner that brings Innova’s renowned features, including predictive diagnostics, to a wireless, smartphone-based platform. Its exceptionally easy setup process combined with advanced features makes it a compelling Bluetooth-only option.
Read our full Innova CarScan Mobile 1000 review
ThinkCar ThinkDiag TKD01 (★★★★☆)
Despite being larger than typical Bluetooth OBD2 adapters, the ThinkCar ThinkDiag TKD01 is built for robustness and durability. It offers extensive manufacturer-specific error codes and advanced fault code analysis, capable of resolving minor issues without mechanic intervention. A subscription of $40 per year is required after the first year.
Read our full ThinkCar ThinkDiag TKD01 review.
Autel AutoLink AL539 (★★★☆☆)
The Autel AutoLink AL539 is specifically designed for diagnosing electrical problems in vehicles, featuring a built-in multimeter. It can detect issues like damaged wiring, short circuits, and blown fuses. It also provides a wide range of live data parameters and pre-inspection readiness test capabilities.
Read our full Autel AutoLink AL539 review
Frequently Asked Questions about OBD2 Scanners
What Exactly is an OBD2 Scanner?
Mechanics don’t rely solely on manual inspection to diagnose car problems. They use diagnostic scanners that plug into your 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 can monitor vehicle systems in real-time and even predict potential future issues. These tools empower car owners and professionals alike to understand a vehicle’s health and troubleshoot problems efficiently.
Understanding the OBD2 Port
The On-Board Diagnostics Version Two (OBD2) port has been a standard feature in most passenger vehicles sold in the US since 1996, Canada since 1998, the EU since 2004, and in Australia, Mexico, and New Zealand since 2006.
This standardized port serves as the interface point to your car’s onboard computer. Various devices can connect to the OBD2 port, including OBD2 scanners, telematics devices for insurance, and increasingly, dash cameras with diagnostic features.
If you’re unsure of your OBD2 port’s location, here’s a guide on finding the OBD2 port in North American vehicles. For locations worldwide, refer to this guide on finding OBD2/EOBD ports globally.
Decoding DTCs: Diagnostic Trouble Codes
DTC stands for Diagnostic Trouble Code. These are error codes generated by a vehicle’s OBD system when it detects a malfunction. OBD2 scanners read these codes to help users diagnose vehicle problems. Standardized DTC codes are consistent across vehicle makes and models, although some manufacturers also use proprietary DTCs specific to their vehicles.
Interpreting DTC Meanings
DTCs can seem like random alphanumeric sequences, but they follow a logical structure that provides clues about the nature of the detected fault.
The first character indicates the affected vehicle system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character is a number: ‘0’ for a generic (standardized) code and ‘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 control and idle control systems
- 6: Computer auxiliary outputs
- 7, 8, 9: Transmission and gearbox faults
- A, B, C: Hybrid propulsion system faults
The fourth and fifth characters further refine the fault description, ranging from 00 to 99, indicating the specific nature of the problem.
OBD2 scanners translate these codes into understandable descriptions. Advanced models offer more detailed information. Online resources and search engines like Google can also be used to research DTC meanings. It’s important to note that there are over 5,000 possible DTCs.
Not all DTCs indicate critical issues. Some may simply warn of minor anomalies like a slightly elevated engine temperature. Context is important when interpreting DTCs.
Choosing the Right OBD2 Scanner: A Buyer’s Guide
If you want to understand your vehicle’s health and diagnose problems, an OBD2 scanner is an indispensable tool. It provides access to the same diagnostic information used by dealerships and repair shops.
There are two main types of OBD2 scanners:
Handheld OBD2 Scanners: These come with an integrated screen and a cable to connect to the OBD port. They are self-contained units.
Wireless OBD2 Scanners: These plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for data display and interaction.
Both types offer high-performance options under $200, and some basic models are available for under $30. The key is to choose an OBD2 scanner that balances size, features, and the ability to accurately read fault codes and live data. Here are critical factors to consider:
- Ease of Setup: A scanner should be quick and easy to set up so you can use it promptly when diagnosing a problem.
- Fault Code Explanation: The best scanners not only display fault codes but also provide clear explanations, enabling you to understand the issue and decide on repair actions, whether DIY or professional.
- I/M Readiness Check: A valuable feature is the ability to perform emissions system tests to determine if your vehicle will pass emissions inspections.
- Accuracy: Scanner accuracy is paramount. Inaccurate readings are worse than no information at all.
- Size and Portability: A compact and lightweight scanner is more likely to be kept in your vehicle for on-the-go diagnostics.
- Live Data Capability: Access to real-time engine data (RPM, temperature, etc.) is crucial for diagnosing intermittent or performance-related issues.
- Data Visualization (Graphs): Visual data representation through graphs is often more insightful than raw numbers, especially for comparative analysis.
- Warranty and Updates: Look for scanners with robust warranties and software update options to ensure long-term usability and compatibility with newer vehicles. Lifetime warranties are a significant plus.
The choice between handheld and wireless scanners depends on personal preference. Consider whether you prefer a dedicated device (handheld) or the convenience of using your smartphone or tablet (wireless).
Longevity is important; prioritize scanners with lifetime updates or warranties to keep pace with evolving automotive technology.
For handheld scanners, screen size and clarity are crucial. Opt for the largest, brightest, and easiest-to-read display, ideally with icon-based navigation. If durability is a concern, consider ruggedized scanners with shock-absorbing bumpers.
Explore extra features like built-in multimeters, manufacturer-specific code reading, and PDF report generation, which can add significant value.
The price range for capable OBD2 scanners is surprisingly affordable, with professional-level features available for under $100. This cost is often less than an hour of labor at a repair shop, making an OBD2 scanner a cost-effective investment.
Our OBD2 Scanner Testing Methodology
To evaluate OBD2 scanners, we conducted hands-on testing using a 2014 Audi A4 Allroad over several weeks in various driving and garage scenarios.
For each scanner, we first verified its ability to correctly identify the vehicle identification number (VIN).
For wireless scanners, we tested connectivity with different devices: Apple iPad Pro, Microsoft Surface, and Samsung Galaxy S9+ via Bluetooth or Wi-Fi. Handheld scanners were directly powered by the OBD2 port.
We measured cable lengths for handheld units and wireless range for Bluetooth scanners. With the engine running, we monitored engine parameters and then simulated a fault by disconnecting the engine oil temperature sensor.
We assessed the scanner’s ability to accurately report the fault, provide fault details, clear the check engine light after resolving the issue, and erase the error code.
Finally, we road-tested each scanner to evaluate its ability to display live operating data, such as engine speed, timing, and coolant temperature, noting whether data was presented numerically, graphically, or as simulated gauges.
We analyzed the fault codes reported by each scanner. OBD2 fault codes consist of a letter prefix and four numbers:
- Powertrain (P)
- Body (B)
- Chassis (C)
- Undefined/Network (U)
Of the approximately 5,000 standardized fault codes, generic codes (starting with ‘0’ after the prefix, e.g., P0098 for intake air temperature sensor issue) apply across all makes. Manufacturer-specific codes (starting with ‘1’, e.g., Ford P1112 for intermittent intake air temperature sensor readings) are unique to specific carmakers and often indicate more detailed or proprietary issues.
By thoroughly testing each scanner’s features and performance, we aimed to provide comprehensive and reliable recommendations for choosing the best OBD2 scanner for your needs.
More from Tom’s Guide
- Best portable car jump starters
- Best dash cams
- Best car phone holders
