The check engine light is on, and a wave of dread washes over you. Before you rush to the mechanic, convinced of an expensive repair, there’s a tool that can put you in the driver’s seat when it comes to car diagnostics: the OBD2 scanner. But with so many options on the market, the question naturally arises: what is the best OBD2 scanner for your needs?
OBD2 scanners are your direct line to your car’s onboard computer, unlocking a wealth of information about its health and performance. Whether you’re a seasoned DIYer or a car owner simply curious about that dashboard light, an OBD2 scanner can empower you to understand what’s going on under the hood without immediately incurring professional diagnostic fees.
Not all OBD2 scanners are created equal, however. The market is flooded with devices ranging from basic code readers to professional-grade tools. Navigating this landscape can be confusing. That’s why we’ve put together this guide, based on extensive testing and hands-on experience, to help you determine what is the best OBD2 scanner for your specific situation.
We’ve evaluated a range of OBD2 scanners, from budget-friendly options to high-end professional tools, to bring you our top recommendations. Whether you prioritize portability, affordability, advanced features, or ease of use, we’ve got you covered. Keep reading to discover what is the best OBD2 scanner to keep in your garage and take control of your car’s health.
Here are our top picks for the best OBD2 scanners available right now.
Tom Pritchard
Tom is the Tech Editor, and an expert in reviewing a wide range of consumer products including automotive technology. He’s passionate about making tech accessible and understandable for everyone.
The Quick List: Top OBD2 Scanners
For those in a hurry, here’s a quick rundown of the best OBD2 scanners. Scroll down for detailed reviews and to find out what is the best OBD2 scanner for you.
1. Topdon TopScan: Best Mobile OBD2 Scanner
Effortless Bluetooth setup and professional-grade features in a compact design. Offers diagnostics, repair guidance, parts lists, and predictive analysis.
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2. Launch CR529: Best Cheap OBD2 Scanner
Affordable and powerful, providing essential OBD2 functions alongside advanced features typically found in pricier models. Includes lifetime support and updates.
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3. Topdon Phoenix Lite 2: Best Pro-Level OBD2 Scanner
A robust, tablet-style scanner designed for both professionals and serious DIY enthusiasts. Offers comprehensive diagnostics and a user-friendly interface.
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4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
Functions as both an OBD2 scanner and an auxiliary dashboard display. Combines handheld and Bluetooth capabilities in a compact package.
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5. Carly OBD-II Scanner: Best Scanner with a Companion App
Offers extensive customization and professional-level tests through a user-friendly companion app. Vehicle compatibility is a key factor to consider.
In-Depth Reviews: Finding What is the Best OBD2 Scanner for You
To help you decide what is the best OBD2 scanner for your needs, we delve into detailed reviews of our top picks, outlining their strengths, weaknesses, and key features.
Best Mobile OBD2 Scanner
(Image credit: Topdon)
1. Topdon TopScan
Perfect for in-depth car diagnostics on the go.
Our Expert Review:
Specifications:
- Display/Size: None (App-based)
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: None (App-controlled)
- 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 (horsepower, torque estimation)
- Comprehensive maintenance item coverage
Reasons to Avoid:
- Relatively bulky Bluetooth transmitter
- Some advanced features require subscription after the first year
The Topdon TopScan redefines what is the best OBD2 scanner for mobile use. Don’t let its unassuming appearance fool you; this compact Bluetooth module packs a powerful punch. More than just a basic Bluetooth OBD2 adapter, the TopScan goes above and beyond typical scanners in its class, offering features often found in professional-grade tools.
Beyond reading fault codes and performing essential I/M Readiness tests, the TopScan excels in performance and efficiency analysis. Its ability to estimate horsepower and torque is a standout feature rarely seen in scanners at this price point. Whether you’re aiming to optimize your car’s performance or simply ensure its roadworthiness, the Topdon TopScan is an invaluable addition to your automotive toolkit.
- Read our full Topdon TopScan review.
Best Cheap OBD2 Scanner
(Image credit: Future)
2. Launch CR529
The top OBD2 scanner choice for budget-conscious users seeking exceptional value.
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:
- Remarkably affordable price
- Free lifetime updates
- Convenient pre-inspection report feature
Reasons to Avoid:
- Limited manufacturer-specific codes
- Feels somewhat heavy
- Shorter 1-year warranty
When considering what is the best OBD2 scanner on a budget, the Launch CR529 emerges as a clear frontrunner. Its incredibly low price tag is just the beginning; the level of diagnostic capabilities it offers for the cost is truly impressive. We were genuinely surprised by the features packed into such an affordable device.
While compromises are expected at this price point, such as the absence of manufacturer-specific codes and a slightly hefty feel, the CR529 still delivers essential features. These include live data streaming, instant vehicle inspection reports, and surprisingly detailed insights into your car’s systems. The inclusion of lifetime updates further enhances its value, ensuring long-term usability without subscription fees. For most car owners, the Launch CR529 provides exceptional value and functionality, making it a strong contender for what is the best OBD2 scanner for everyday use.
- Read our full Launch CR529 review.
Best Pro-Level 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-1224700782076728613-20)
3. Topdon Phoenix Lite 2
Bridging the gap between DIY and professional automotive diagnostics.
Our Expert Review:
Specifications:
- Display/Size: Color/8-inch Touchscreen
- Bluetooth/Handheld: Yes/Yes (Wireless)
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of 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 scanning capabilities
- Versatile handheld with Wi-Fi and Bluetooth connectivity
- Large 8-inch touchscreen display
- Extensive range of diagnostic tests and live data parameters
- Includes adapters and a protective hard case
Reasons to Avoid:
- Bulky and heavy design
- Higher price point
- Subscription required for updates after two years
For users seeking what is the best OBD2 scanner that approaches professional-level functionality, the Topdon Phoenix Lite 2 is a compelling option. While it represents a significant investment compared to basic scanners, it delivers a wealth of features that justify the cost. Designed to cater to both experienced mechanics and advanced DIYers, the Phoenix Lite 2 offers a powerful diagnostic experience.
Its wireless design, featuring a Bluetooth-connected control pad, provides exceptional freedom of movement around the vehicle. Despite its size and weight, the scanner’s rugged build and integrated kickstand make it well-suited for workshop environments. The Phoenix Lite 2 boasts advanced features like live data graphing, comprehensive fault code information, and more, surpassing the capabilities of many entry-level scanners. While the subscription requirement for updates after two years is a consideration, the Topdon Phoenix Lite 2 remains a top contender for what is the best OBD2 scanner for comprehensive diagnostics.
- Read our full Topdon Phoenix Lite 2 review.
Best Dual-Purpose OBD2 Scanner
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
A versatile OBD2 scanner that doubles as a supplementary car display.
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 highly portable
- Functions as both a scanner and a secondary car display
- Offers both handheld and Bluetooth scanning modes
Reasons to Avoid:
- Minimalist interface design
- Small screen size
The Ancel BD310 presents a unique proposition when considering what is the best OBD2 scanner for everyday convenience. Its dual-purpose functionality sets it apart, operating as a standard handheld scanner and, when paired with a smartphone via Bluetooth, transforming into a secondary display for real-time engine data within your car’s cabin.
The BD310’s compact and lightweight design makes it exceptionally easy to store in your glovebox, ensuring it’s always readily available. While the 2-inch display is on the smaller side, and the four-button interface may feel slightly basic, these are minor trade-offs for its portability and versatility. Its 56-inch cable offers ample reach for comfortable use while working under the hood. The BD310 effectively performs essential OBD2 functions like I/M readiness tests and provides access to crucial performance data, making it a practical choice for users seeking a convenient and multi-functional OBD2 scanner.
- Read our full Ancel BD310 review.
Best Companion App OBD2 Scanner
(Image credit: Carly)
5. Carly OBD-II Scanner
A feature-rich scanner that shines when paired with its exceptional companion app.
Our Expert Review:
Specifications:
- Display/Size: None (App-based)
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: No
- Live Data Display: Yes
- Number of Keys: None (App-controlled)
- Warranty: Lifetime
- Size: 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 through the app
- Maintenance and repair guidance features
- Lifetime warranty and software updates
Reasons to Avoid:
- Feature availability varies depending on car model
- App subscription can be costly for advanced features
For users who value a seamless and feature-rich app experience, the Carly OBD-II Scanner stands out as what is the best OBD2 scanner in this category. While many Bluetooth scanners offer companion apps, Carly’s app is exceptional in its design and functionality.
Beyond basic fault code reading and diagnostics, the Carly app provides repair assistance, used car inspection tools, and a wealth of customization options. The lifetime warranty is a significant advantage, offering long-term peace of mind. However, it’s crucial to verify vehicle compatibility, as feature availability varies across car models. Additionally, accessing advanced features requires an ongoing subscription, which can add to the overall cost. Despite these considerations, the Carly OBD-II Scanner, with its outstanding app, provides a premium and user-centric diagnostic experience, making it a strong contender for what is the best OBD2 scanner for app-driven users.
- Read our full Carly OBD scanner review.
Other OBD2 Scanners We Tested
While the above scanners represent our top picks for what is the best OBD2 scanner in various categories, we’ve also tested other noteworthy models:
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Innova CarScan Mobile 1000 (★★★★☆): An innovative Bluetooth scanner with predictive diagnostics and a simple setup process. Read the full Innova CarScan Mobile 1000 review.
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ThinkCar ThinkDiag TKD01 (★★★★☆): A robust Bluetooth OBD2 scanner with extensive manufacturer-specific codes and fault-clearing capabilities. Subscription required after the first year. Read our full ThinkCar ThinkDiag TKD01 review.
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Autel AutoLink AL539 (★★★☆☆): Designed for electrical diagnostics with a built-in multimeter. Offers comprehensive live data and pre-inspection readiness checks. Read our full Autel AutoLink AL539 review.
Frequently Asked Questions: Understanding OBD2 Scanners
To further clarify what is the best OBD2 scanner and how these devices work, here are answers to some frequently asked questions:
What is an OBD2 Scanner?
Mechanics use diagnostic scanners plugged into your car’s OBD port to access data from the onboard computer and diagnose issues. OBD2 scanners read and interpret error codes generated by your car when it detects a problem. Advanced scanners can also monitor systems in real-time and even predict potential future issues. Understanding what is the best OBD2 scanner starts with understanding their core function: accessing your car’s diagnostic data.
What is the OBD2 Port?
The On-Board Diagnostics Version Two (OBD2) port is a standardized port found in most passenger vehicles sold in the US since 1996, and in other regions like Canada, Europe, and Australia in subsequent years. This port serves as the interface point to your car’s onboard computer. OBD2 scanners and other devices like insurance black boxes and dash cams connect through this port. Knowing the location of your OBD2 port is the first step in using a scanner to understand what is happening with your car.
If you’re unsure about the location, here’s how to find your car’s OBD2 port in North American vehicles. For worldwide locations, refer to this guide on finding your OBD2/EOBD port.
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 DTCs, allowing users to identify the source of the issue. Standardized DTCs exist across vehicle makes and models, while some manufacturers use unique DTCs. Interpreting DTCs is key to determining what is wrong with your car using an OBD2 scanner.
What Do DTCs Actually Mean?
DTCs might seem cryptic, but they follow a logical structure. The first letter indicates the affected system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character is a number: 0 for generic codes, 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: 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 (00-99). OBD2 scanners translate these codes into descriptions, with advanced models providing more detailed information. While some research (e.g., on Google) may be needed, understanding DTC structure helps in deciphering what your car is telling you. It’s important to remember that not all DTCs indicate critical problems; some may be minor warnings.
Choosing the Best OBD2 Scanner: Key Considerations
Determining what is the best OBD2 scanner for you depends on your individual needs and priorities. Here are key factors to consider when making your choice:
OBD2 scanners come in two main types:
- Handheld OBD2 Scanners: These have their own display and connect directly to your car’s OBD port via a cable.
- Wireless OBD2 Scanners: These plug into the OBD port and communicate wirelessly (usually Bluetooth) with a smartphone or tablet for display and control.
Regardless of the type, prioritize these features:
- Easy Setup: A scanner should be quick and easy to set up for prompt diagnostics.
- Fault Codes and Explanations: The scanner should not only display fault codes but also provide clear explanations to aid in understanding and repair.
- I/M Readiness Check: Essential for emissions testing, this feature verifies if your car will pass inspection.
- Accuracy: Reliable and accurate results are paramount for effective diagnostics.
- Size and Weight: Consider portability and ease of storage, especially for on-the-go use.
- Live Data: Real-time data streaming helps diagnose intermittent issues and monitor engine performance.
- Graphs: Visual data representation enhances understanding and comparison of readings.
- Warranty: Look for a reasonable warranty period for product assurance, with some offering lifetime warranties.
When deciding what is the best OBD2 scanner, consider these additional factors:
- Connectivity: Choose between handheld or wireless based on your preference for screen size and portability.
- Longevity: Opt for scanners with lifetime updates or warranties for long-term value.
- Display (Handheld): Prioritize screen size, brightness, and ease of readability.
- Ruggedness: For workshop environments, consider rugged scanners with protective bumpers.
- Extra Features: Some scanners offer features like multimeters, manufacturer-specific code reading, and PDF report generation.
- Price: Balance features and budget to find the best value for your needs. Professional-level features are available at surprisingly affordable prices.
How We Test OBD2 Scanners
To determine what is the best OBD2 scanner, we conduct thorough testing using a real vehicle (a 2014 Audi A4 Allroad) in various scenarios. Our testing process involves:
- VIN Verification: Ensuring each scanner accurately reads the car’s Vehicle Identification Number (VIN).
- Connectivity Testing: Evaluating Bluetooth and Wi-Fi connectivity for wireless scanners with devices like iPads, Surface tablets, and Samsung Galaxy phones. Handheld scanner connectivity is assessed by direct OBD-II port connection.
- Range and Cable Length Measurement: Assessing wireless range for Bluetooth scanners and cable length for handheld units.
- Live Data Monitoring: Observing real-time engine and system data while the car is running.
- Fault Code Generation and Reading: Simulating a fault by disconnecting the engine oil temperature sensor and verifying the scanner’s ability to detect and report the error.
- Fault Code Clearing: Testing the scanner’s ability to clear the generated fault code and turn off the check engine light after resolving the simulated issue.
- Road Testing: Evaluating the scanner’s ability to display and graph operational data like engine speed, timing, and coolant temperature during actual driving conditions.
- Code Interpretation: Analyzing the fault codes provided by each scanner, noting the level of detail and explanation offered.
Our testing methodology focuses on real-world use and practical scenarios to provide you with reliable recommendations for what is the best OBD2 scanner for your automotive diagnostic needs.
More from Tom’s Guide
Explore more automotive technology reviews and guides from Tom’s Guide:
- Best Car Dash Cams
- Best Portable Car Jump Starters
- Best Car Phone Mounts
By understanding your needs and considering the factors outlined in this guide, you can confidently choose what is the best OBD2 scanner to empower yourself with automotive diagnostic capabilities and take control of your car’s health.
