Unlocking the secrets hidden within your car’s onboard computer is no longer exclusive to professional mechanics. Modern OBD-II scanners act as the key, granting you access to a wealth of information about your vehicle’s health and performance. Whether you’re facing a perplexing dashboard light or simply want to understand your car better, the right OBD2 scanner can empower you to diagnose issues efficiently and potentially save significant repair costs.
However, the world of OBD-II scanners can be overwhelming. With a multitude of options available, ranging from basic code readers to advanced diagnostic tools, finding the “Obd2 Scanner That Does Everything” might seem like a daunting task. We’ve rigorously tested a variety of OBD-II scanners to bring you a curated list of top performers, ensuring you can confidently choose a device that meets your needs and provides comprehensive diagnostic capabilities.
From user-friendly wireless options ideal for quick checks to professional-grade scanners offering in-depth analysis, we’ve explored the spectrum. This guide will delve into the best OBD2 scanners on the market, highlighting their strengths and weaknesses, and ultimately helping you pinpoint the perfect tool to become your car’s ultimate diagnostic companion. Keep reading to discover our top recommendations and gain a deeper understanding of how OBD-II scanners work and what those cryptic error codes actually mean.
Here are our expert-selected top picks for the best OBD2 scanners available today, each offering a unique blend of features and capabilities to cater to various needs and budgets.
Tom Pritchard
Tom is the Tom’s Guide UK Phones Editor, with extensive experience covering consumer technology and a keen interest in automotive tech, including electric vehicles and diagnostic tools.
The Top OBD2 Scanners at a Glance
Based on our rigorous hands-on testing, here’s a quick overview of the best OBD2 scanners you can purchase right now. For more detailed insights into each scanner and why they excel, simply scroll down.
Top Pick for Mobile Scanning 1. Topdon TopScan
This Bluetooth scanner stands out for its effortless setup and a surprisingly robust suite of professional-level diagnostic features, all within a compact design. Expect comprehensive diagnostics, repair guidance, parts information, and even predictive analysis to anticipate potential problems.
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Best Budget-Friendly Scanner 2. Launch CR529
Priced around $40, the Launch CR529 delivers exceptional value without compromising essential OBD-II scanner functions. It offers a range of desirable features, including lifetime support and updates, making it a smart choice for budget-conscious users seeking a reliable diagnostic tool.
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Top Professional-Grade Scanner 3. Topdon Phoenix Lite 2
Resembling a rugged tablet, the Topdon Phoenix Lite 2 is built for both professionals and experienced DIYers. It offers a powerful diagnostic experience, approaching professional-level capabilities in a durable and user-friendly package.
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Best Dual-Function Scanner 4. Ancel BD310
The Ancel BD310 is a versatile tool that not only functions as a standard OBD-II scanner but can also enhance your car’s dashboard by displaying real-time engine specifications. Its smartphone compatibility and reasonable price add to its appeal.
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Best Scanner with Companion App 5. Carly OBD-II Scanner
The Carly OBD-II Scanner’s value is highly dependent on your car’s make, with brands like VW, BMW, and Ford benefiting the most from its features. However, it boasts one of the most impressive companion apps we’ve encountered, offering extensive customization and professional-grade testing options.
Deep Dive into the Best OBD2 Scanners
Why Trust Tom’s Guide? Our team of expert reviewers dedicate countless hours to evaluating and comparing products to help you make informed decisions. Learn more about our rigorous testing and review process.
Top Mobile OBD2 Scanner
(Image credit: Topdon)
1. Topdon TopScan
Ideal for Comprehensive Vehicle Analysis On-the-Go
Read our in-depth review
Specifications:
- Display: None (Smartphone App-Based)
- Connectivity: Bluetooth
- Handheld: No
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: None (App Interface)
- Warranty: 2 years
- Dimensions: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Exceptional vehicle diagnostic coverage
- Real-time live data monitoring
- Unique performance indicators
- Maintenance item coverage
Reasons to Consider Other Options:
- Larger transmitter size
- Subscription required for some features after the first year
Despite its unassuming appearance, the Topdon TopScan is a powerhouse of automotive diagnostics. This compact Bluetooth OBD-II module transcends the capabilities of typical scanners in its category. Beyond basic fault code reading and I/M Readiness tests, the TopScan delves into performance and efficiency analysis. It can even estimate your car’s horsepower and torque, features often absent in scanners costing significantly more. Whether you’re focused on performance tuning or ensuring your vehicle’s roadworthiness, the TopScan is a valuable addition to any toolkit.
Read our full Topdon TopScan review
Best Value OBD2 Scanner
(Image credit: Future)
2. Launch CR529
Unbeatable Diagnostics Under $50
Read our expert review
Specifications:
- Display: 2.8-inch Color Screen
- Connectivity: Cable (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
- Convenient pre-inspection report feature
Reasons to Consider Other Options:
- Lacks manufacturer-specific codes
- Feels somewhat heavy
- Shorter 1-year warranty
The Launch CR529 redefines value in OBD-II scanners. Its remarkably low price tag of around $38 belies its impressive diagnostic capabilities. For such an accessible price, the CR529 offers a surprising level of features, making it an excellent choice for budget-conscious users who still demand robust functionality. While compromises are present, such as the absence of manufacturer-specific codes and a slightly hefty feel, the CR529 compensates with live data display, an instant inspection feature, and a remarkably detailed view into your car’s systems. The inclusion of lifetime updates ensures its long-term usability without subscription fees. While perhaps not ideal for professional mechanics, the CR529 is an outstanding value for the average car owner.
Read our comprehensive Launch CR529 review
Top Professional-Level OBD2 Scanner
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(Image credit: Future)
3. Topdon Phoenix Lite 2
Bridging the Gap Between DIY and Professional Diagnostics
Explore our expert analysis
Specifications:
- Display: 8-inch Color Touchscreen
- Connectivity: Bluetooth, Wi-Fi
- Handheld: Yes (Tablet-Style)
- 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:
- Approaches professional OBD scanner capabilities
- Versatile handheld with Wi-Fi and Bluetooth
- Large 8-inch touchscreen display
- Extensive range of diagnostic tests and live data options
- Includes adapters and a protective hard case
Reasons to Consider Other Options:
- Bulky and heavy design
- Higher price point
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 is a significant investment, positioned above many consumer OBD-II scanners, but it delivers exceptional value for its price. It effectively blurs the lines between amateur and professional diagnostic tools, catering to both experienced DIY enthusiasts and professional mechanics. Its wireless design, with a Bluetooth receiver connecting the control pad to the car’s OBD port, provides unparalleled freedom of movement around the vehicle. While the scanner itself is substantial in size and weight, it features a kickstand and rugged construction designed to withstand workshop environments. The Phoenix Lite 2 boasts advanced features like live data graphing and comprehensive fault information, exceeding the capabilities of most budget scanners. However, be aware of the subscription requirement for firmware updates after the initial two years.
Read our detailed Topdon Phoenix 2 Lite review
Best Dual-Purpose OBD2 Scanner
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
OBD-II Scanner and Secondary Display in One
See our expert evaluation
Specifications:
- Display: 2-inch Color Screen
- Connectivity: Bluetooth, Cable (Handheld)
- 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 for portability
- Functions as both a scanner and a secondary car display
- Offers handheld and Bluetooth scanning options
Reasons to Consider Other Options:
- Minimalist interface design
- Small screen size
The Ancel BD310 offers a unique dual functionality, serving as both a conventional handheld OBD-II scanner and a supplementary display for your car’s vital engine data. When connected to a smartphone via Bluetooth, it can project key engine parameters onto its screen, enhancing your driving information. Its compact and lightweight design makes it incredibly convenient to store in your glovebox. While the 2-inch display is relatively small and the four-button interface might feel slightly basic, these are minor trade-offs for its portability and dual-purpose nature. The BD310’s 56-inch cable provides ample reach, and it competently performs essential functions like I/M readiness tests and displays performance metrics such as coolant temperature, engine timing, and speed.
Read our complete Ancel BD310 review.
Best OBD2 Scanner with Companion App
(Image credit: Carly)
5. Carly OBD-II Scanner
App-Driven Diagnostics Tailored to Your Car
Explore our full review
Specifications:
- Display: None (Smartphone App-Based)
- Connectivity: Bluetooth
- Handheld: No
- I/M Readiness Test: No
- Live Data Display: Yes
- Keys: None (App Interface)
- Warranty: Lifetime
- Dimensions: 2.9 x 1.5 x 0.7 inches
- Weight: 0.7 ounces
Reasons to Buy:
- User-friendly app interface
- Extensive customization options within the app
- Real-time live data display
- Covers maintenance and repair procedures
- Lifetime warranty and updates
Reasons to Consider Other Options:
- Feature availability varies by car make and model
- App subscription can be costly for full functionality
The Carly OBD Scanner distinguishes itself with its exceptional companion app, offering a significantly more refined experience than many Bluetooth scanner apps. Beyond basic fault code reading and clearing, the Carly app provides repair assistance, used car inspection tools, and a wealth of customization settings. Its lifetime warranty adds further value. However, the breadth of features accessible is contingent on your car’s make and model, with VW, BMW, and Ford vehicles enjoying the most comprehensive support. Unlocking the full potential of the Carly scanner requires an ongoing subscription, which can become expensive if you require more than basic OBD functions.
Read our in-depth Carly OBD scanner review
Additional OBD2 Scanners We Evaluated
- Innova CarScan Mobile 1000 (★★★★☆): This Bluetooth OBD-II scanner stands out for its innovative features, including predictive diagnostics, mirroring the capabilities of Innova’s standalone scanners in a wireless format. Its straightforward setup process enhances its appeal as a Bluetooth-only option. Read the full Innova CarScan Mobile 1000 review
- ThinkCar ThinkDiag TKD01 (★★★★☆): While larger than typical Bluetooth OBD-II adapters, the TKD01’s robust build contributes to its durability. It offers extensive manufacturer-specific error codes and advanced fault code analysis, potentially resolving minor issues without mechanical intervention. A $40 subscription is required after the first year. Read our full ThinkCar ThinkDiag TKD01 review.
- Autel AutoLink AL539 (★★★☆☆): Specifically designed for electrical diagnostics, this OBD-II scanner incorporates a built-in multimeter. It excels at identifying electrical faults like damaged cables, shorts, and blown fuses. It also provides a wide array of live data and pre-inspection readiness checks. Read our full Autel AutoLink AL539 review
Frequently Asked Questions About OBD2 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 system via the OBD port. Instead of manually disassembling components, scanners quickly retrieve error codes and live data, streamlining the diagnostic process. Basic scanners read and interpret error codes generated by the car’s computer when it detects a problem. More advanced models offer real-time system monitoring and even predictive analysis of potential future issues.
What is the OBD-II Port?
The On-Board Diagnostics Version Two (OBD-II) port is a standardized interface found in virtually all passenger vehicles sold in the US since 1996, Canada since 1998, the EU since 2004, and Australia, Mexico, and New Zealand since 2006. This port serves as the connection point for various devices to communicate with the car’s computer, including OBD-II scanners, insurance telematics devices, and dashcams. If you’re unsure of your OBD-II port’s location, resources are available to guide you in finding your car’s OBD-II port in North American vehicles and worldwide OBD-II/EOBD port locations.
What is a DTC?
DTC stands for Diagnostic Trouble Code. These are alphanumeric codes generated by a car’s OBD system when it identifies a malfunction. OBD-II scanners read and interpret these DTCs, providing users with insights into the nature of the problem. While many DTCs are standardized across vehicle manufacturers, some manufacturers utilize proprietary DTCs specific to their vehicles.
Understanding DTC Meanings
DTCs, initially appearing as random combinations of letters and numbers, follow a logical structure. The first character indicates the affected vehicle system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character, a number, denotes whether the code is generic (0) or manufacturer-specific (1). The third character pinpoints the specific 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-specific propulsion faults
The fourth and fifth characters provide further detail about the specific fault, ranging from 0 to 99. OBD-II scanners translate these codes into understandable descriptions, with advanced models offering more detailed information. Online resources like Google can also aid in DTC interpretation. It’s important to note that over 5,000 DTCs exist, and not all signify critical issues. Some may indicate minor problems, such as slightly elevated engine temperature.
Choosing the Right OBD2 Scanner for Your Needs
For anyone seeking deeper insights into their vehicle’s operation or troubleshooting issues, an OBD-II scanner is an invaluable tool. It provides access to the same diagnostic information used by dealerships and repair shops, empowering you to understand your car’s condition. OBD-II scanners are broadly categorized into two types:
- Handheld OBD-II scanners: These units feature an integrated screen and a cable for direct connection to the OBD port.
- Wireless OBD-II scanners: These adapters plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for displaying diagnostic data.
Regardless of the type, numerous high-quality OBD-II scanners are available for under $200, with some costing less than $30. Key considerations when selecting an OBD-II scanner include:
- Ease of Setup: A straightforward setup process ensures you’ll readily use the scanner for timely diagnostics.
- Fault Code Explanation: Effective scanners not only display fault codes but also provide clear explanations to facilitate DIY repairs or informed communication with mechanics.
- I/M Readiness Check: A valuable feature for emissions testing, allowing you to verify your vehicle’s readiness for inspection.
- Accuracy: Reliable and accurate results are paramount for effective diagnostics.
- Size and Weight: Portability is crucial for convenient storage and on-the-go diagnostics.
- Live Data: Real-time data monitoring aids in pinpointing intermittent issues.
- Data Graphs: Visual data representation enhances analysis, particularly for comparative assessments.
- Warranty: Opt for scanners with robust warranties, ideally lifetime warranties or extended coverage, to ensure long-term value.
When choosing, consider whether you prefer the convenience of a wireless scanner with your smartphone or tablet or a dedicated handheld unit. Longevity is important, so prioritize scanners with lifetime updates or warranties. For handheld scanners, prioritize screen size and clarity. Ruggedness can be beneficial for durability. Additional features like built-in multimeters or manufacturer-specific code reading can also be advantageous. Ultimately, the affordability of even sophisticated OBD-II scanners makes them a worthwhile investment, potentially saving you significant repair costs compared to professional mechanic labor.
Our OBD2 Scanner Testing Methodology
To rigorously evaluate OBD2 scanners, I utilized my 2014 Audi A4 Allroad over several weeks in various driving conditions. Each scanner was connected to the vehicle’s OBD-II port, and VIN reporting accuracy was verified. For wireless scanners, Bluetooth or Wi-Fi connections were established with devices like an Apple iPad Pro, Microsoft Surface, or Samsung Galaxy S9+. Handheld scanners were powered directly through the OBD-II port. Cord lengths (for handhelds) and wireless ranges were measured. With the engine running, engine and system parameters were monitored, followed by intentionally disconnecting the engine oil temperature sensor to induce a fault code. Scanner accuracy in reporting the fault, clearing the code, and resetting the check engine light were assessed. Finally, on-road testing evaluated live data display, including engine speed, timing, and coolant temperature, noting data presentation formats (numeric, graphs, gauges). The standardized fault code structure (letter prefix and numeric code) and the distinction between generic and manufacturer-specific codes were also considered during testing, understanding that codes like P0098 (generic intake air temperature sensor issue) differ from manufacturer-specific codes like Ford’s P1112 (intermittent intake air temperature sensor).
