Best OBD2 Scanners in 2024: Expert Reviews & Buyer’s Guide

The check engine light is on, and a wave of dread washes over you. Instead of rushing to the mechanic and facing a potentially hefty bill, what if you could understand what your car is trying to tell you? That’s where the best OBD2 scanners come in. These ingenious devices connect to your car’s onboard computer, acting as interpreters for the complex language of your vehicle’s diagnostics system. Whether it’s a minor sensor issue or a more significant engine problem, an OBD2 scanner can give you the insight you need, right at your fingertips.

Navigating the world of OBD2 scanners can be overwhelming. With countless options on the market, from basic code readers to professional-grade tools, choosing the right one can feel like deciphering another set of cryptic codes. But fear not, because we’ve spent years testing and evaluating a wide array of OBD2 scanners to bring you a curated list of the top performers. We’ve considered factors like ease of use, features, accuracy, and value to help you find the perfect scanner for your needs and budget.

From the incredibly user-friendly and wireless Topdon TopScan, ideal for on-the-go diagnostics, to the budget-friendly yet surprisingly capable Launch CR529, and the professional-grade power of the Topdon Phoenix Lite 2, we’ve got you covered. Keep reading to discover our top picks for the best OBD2 scanners available today, along with a comprehensive guide to understanding how these devices work and how to choose the right one for you.

Top OBD2 Scanner Recommendations: Quick List

Before diving into detailed reviews, here’s a quick overview of our top recommended OBD2 scanners:

1. Topdon TopScan: Best Mobile OBD2 Scanner – Wireless, feature-rich, and incredibly easy to use with your smartphone.

2. Launch CR529: Best Cheap OBD2 Scanner – Offers excellent value with comprehensive features at an affordable price point.

3. Topdon Phoenix Lite 2: Best Pro-Level OBD2 Scanner – Delivers near-professional diagnostic capabilities in a rugged, user-friendly device.

4. Ancel BD310: Best Dual-Purpose OBD2 Scanner – Functions as both a scanner and a supplementary dashboard display for engine data.

5. Carly OBD-II Scanner: Best Scanner with a Companion App – Offers an exceptional app experience with advanced customization and tests, particularly for specific car brands.

Continue scrolling for in-depth reviews, key features, and a detailed buyer’s guide to help you select the best OBD2 scanner for your specific needs.

Tom Pritchard, Automotive Expert & Tech Reviewer

Best Mobile OBD2 Scanner

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1. Topdon TopScan

The Topdon TopScan redefines mobile diagnostics, packing professional-level features into a compact, Bluetooth-enabled device. Its seamless wireless connectivity and intuitive smartphone app make car diagnostics accessible to everyone, from seasoned mechanics to first-time car owners.

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[](best cheap scanner)

2. Launch CR529

The Launch CR529 proves that you don’t have to break the bank for a reliable OBD2 scanner. This handheld device combines affordability with a robust set of features, making it an excellent choice for budget-conscious users who don’t want to compromise on functionality. Lifetime updates add even more value.

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[](best rugged scanner)

3. Topdon Phoenix Lite 2

The Topdon Phoenix Lite 2 bridges the gap between amateur and professional diagnostics. This rugged, tablet-style scanner boasts an impressive array of advanced features, typically found in high-end professional tools, yet remains user-friendly enough for DIY enthusiasts.

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[](best dual-purpose scanner)

4. Ancel BD310

The Ancel BD310 offers versatility beyond basic code reading. This clever device not only functions as a standard OBD2 scanner but can also transform into a supplementary display, providing real-time engine data on your dashboard. Its compact size and dual functionality make it a practical tool for everyday car monitoring.

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[](best scanner with a companion app)

5. Carly OBD-II Scanner

The Carly OBD-II Scanner stands out with its exceptional companion app, offering a truly connected car diagnostic experience. The value of the Carly scanner is heavily reliant on your vehicle’s make, with brands like VW, BMW, and Ford enjoying the most comprehensive feature set. Its app-centric approach delivers advanced customization and professional-level tests, making it a top contender if your car is compatible.

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Detailed Reviews of the Best OBD2 Scanners

Why Trust Tom’s Guide? Our team of expert reviewers dedicates countless hours to hands-on testing and in-depth analysis of products and services, ensuring we provide you with unbiased and reliable recommendations to help you make the best choices. Learn more about our rigorous testing methodology.

1. Topdon TopScan: Best Mobile OBD2 Scanner

(Image credit: Topdon)

Key Features:

• Display/Size: None (App-based)
• Bluetooth/Handheld: Yes/No
• I/M Readiness Test: Yes
• Live Data Display: Yes
• Keys: None (App-controlled)
• Warranty: 2 years
• Size: 3.2 x 2.0 x 1.1 inches
• Weight: 2.6 ounces

Pros:

• Excellent vehicle diagnostic coverage
• Comprehensive live data monitoring
• Unique performance indicators (horsepower, torque estimation)
• Maintenance item coverage
• User-friendly mobile app interface

Cons:

• Larger transmitter size compared to some basic Bluetooth adapters
• Advanced features may require a subscription after the first year

The Topdon TopScan may appear deceptively simple, but beneath its compact exterior lies a powerhouse of diagnostic capabilities. This Bluetooth OBD2 scanner transcends the limitations of basic code readers, offering a suite of features that rival professional-grade tools. Connecting wirelessly to your smartphone via an intuitive app, the TopScan unlocks a wealth of information about your vehicle’s health and performance.

Beyond standard fault code reading and I/M Readiness tests, the TopScan delves deeper, providing performance and efficiency analysis. Impressively, it can even estimate your car’s horsepower and torque – features rarely seen in scanners at this price point, and often absent even in much pricier devices. Whether you’re aiming to optimize your car’s performance or simply ensure its roadworthiness, the Topdon TopScan is an invaluable addition to any car owner’s toolkit.

Read our full Topdon TopScan review for a comprehensive analysis.

2. Launch CR529: Best Cheap OBD2 Scanner

(Image credit: Future)

Key Features:

• Display/Size: Color/ 2.8-inches
• Bluetooth/Handheld: No/Yes
• I/M Readiness Test: Yes
• Live Data Display: Yes
• Keys: 8
• Warranty: 1 year
• Size: 6.5 x 3.8 x 1.2 inches
• Weight: 11 ounces

Pros:

• Extremely affordable
• Lifetime free updates
• Easy pre-inspection report generation
• User-friendly interface

Cons:

• Lacks manufacturer-specific advanced codes
• Slightly heavier than some handheld scanners
• 1-year warranty could be longer

The Launch CR529 redefines value in the OBD2 scanner market. Priced under $50, it delivers a surprising level of diagnostic capability, exceeding expectations for a scanner in this price range. It’s an ideal entry point for users seeking essential OBD2 functionality without a hefty investment.

While compromises are expected at this price, the CR529 still provides crucial features like live data streaming, instant vehicle inspection reports, and a remarkably detailed look into your car’s systems. The inclusion of lifetime free updates is a significant advantage, ensuring the scanner remains current and functional for years to come, without any subscription fees. While it may lack advanced manufacturer-specific codes and has a slightly heavier feel, the Launch CR529 offers exceptional value for everyday car diagnostics.

Explore our detailed Launch CR529 review to learn more.

3. Topdon Phoenix Lite 2: Best Pro-Level OBD2 Scanner

(Image credit: Future)

Key Features:

• Display/Size: Color/8-inch Touchscreen
• Bluetooth/Handheld: Yes/Yes (Wireless control pad)
• I/M Readiness Test: Yes
• Live Data Display: Yes (Graphing)
• Keys: Touchscreen
• Warranty: 2 years
• Size: 10.2 x 7.2 x 1.7 inches
• Weight: 2.6 pounds

Pros:

• Near-professional OBD2 scanning capabilities
• Versatile handheld with Wi-Fi and Bluetooth connectivity
• Large, user-friendly 8-inch touchscreen
• Extensive array of diagnostic tests and live data parameters
• Includes adapters and a hard protective case

Cons:

• Higher price point compared to other scanners
• Bulky and heavier design may be less portable
• Subscription required for updates after two years

The Topdon Phoenix Lite 2 steps into the realm of professional diagnostics, offering a robust and feature-rich OBD2 scanning experience. While carrying a higher price tag, it delivers exceptional value for users seeking advanced capabilities beyond basic code reading. It’s equally suited for experienced DIYers and professional mechanics seeking a powerful yet user-friendly tool.

The Phoenix Lite 2 boasts wireless operation, with a Bluetooth-connected control pad for freedom of movement around the vehicle. Its rugged design, complete with a kickstand, ensures durability in workshop environments. Beyond comprehensive fault code reading, it offers advanced features like live data graphing and in-depth fault information. While firmware updates require a subscription after two years, the initial two years provide substantial value and functionality.

Read our in-depth Topdon Phoenix 2 Lite review for a complete analysis.

4. Ancel BD310: Best Dual-Purpose OBD2 Scanner

(Image credit: Tom’s Guide)

Key Features:

• Display/Size: Color/2 inches
• Bluetooth/Handheld: Yes/Yes
• I/M Readiness Test: Yes
• Live Data Display: Yes
• Keys: 4
• Warranty: 3 years
• Size: 5.1 x 2.4 x 0.6 inches
• Weight: 5.4 ounces

Pros:

• Lightweight and compact, glovebox-friendly
• Functions as both an OBD2 scanner and secondary car display
• Offers handheld and Bluetooth smartphone connectivity
• Long 56-inch cable for convenient access

Cons:

• Minimalist interface may lack visual appeal
• Small 2-inch screen can feel constrained

The Ancel BD310 distinguishes itself with its dual-purpose design, serving as both a capable OBD2 scanner and a supplementary vehicle data display. Its compact size and lightweight build make it incredibly portable and convenient for everyday use.

Connecting to your smartphone via Bluetooth, the BD310 can display key engine parameters directly on its screen, acting as a real-time dashboard extension. It also functions as a standard handheld OBD2 scanner, offering features like I/M Readiness tests and performance data retrieval. While its minimalist interface and small screen might be considered drawbacks, its dual functionality and portability make the Ancel BD310 a practical and versatile tool for car owners.

Explore our full Ancel BD310 review for more details.

5. Carly OBD-II Scanner: Best Scanner with a Companion App

(Image credit: Carly)

Key Features:

• Display/Size: None (App-based)
• Bluetooth/Handheld: Yes/No
• I/M Readiness Test: No
• Live Data Display: Yes
• Keys: None (App-controlled)
• Warranty: Lifetime
• Size: 2.9 x 1.5 x 0.7 inches
• Weight: 0.7 ounces

Pros:

• User-friendly and feature-rich companion app
• Extensive customization options within the app
• Live data display and advanced diagnostic functions
• Maintenance and repair guidance within the app
• Lifetime warranty and software updates

Cons:

• Feature availability varies significantly by car make and model
• Subscription required for advanced features beyond basic OBD2 functions

The Carly OBD-II Scanner prioritizes the user experience through its exceptional companion app. While many Bluetooth scanners offer basic app interfaces, Carly stands out with one of the most comprehensive and user-friendly apps available. However, the true value of Carly is highly dependent on your vehicle’s brand, with owners of VW, BMW, and Ford vehicles benefiting the most from its extensive features.

Beyond standard code reading and diagnostics, the Carly app offers repair assistance, used car checks, and numerous customization options for compatible vehicles. The lifetime warranty and updates are significant benefits. However, feature availability is car-dependent, and accessing advanced functions requires a subscription, which can add to the overall cost. If you own a compatible vehicle and value a seamless, app-driven diagnostic experience, the Carly OBD-II Scanner is a compelling option.

Read our complete Carly OBD scanner review for a deeper dive.

Other OBD2 Scanners We’ve Tested

• Innova CarScan Mobile 1000 (★★★★☆): A highly innovative Bluetooth OBD2 scanner, the Innova CarScan Mobile 1000 mirrors the impressive features of Innova’s handheld scanners but in a wireless, smartphone-based format. Its remarkably simple setup and predictive diagnostic capabilities make it a standout Bluetooth-only option. Read the full Innova CarScan Mobile 1000 review.

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• ThinkCar ThinkDiag TKD01 (★★★★☆): The ThinkCar ThinkDiag TKD01, while larger than typical Bluetooth OBD2 adapters, compensates with its robust, almost indestructible build. It offers a wealth of manufacturer-specific error codes and extended fault-code functionality, capable of resolving minor issues without mechanic intervention. A subscription is required after the first year. Read our full ThinkCar ThinkDiag TKD01 review.

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• Autel AutoLink AL539 (★★★☆☆): The Autel AutoLink AL539 excels in diagnosing electrical problems, thanks to its integrated multimeter. It can identify issues like burnt wires, electrical shorts, and blown fuses. It also provides extensive live data and pre-inspection readiness checks. Read our full Autel AutoLink AL539 review.

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Frequently Asked Questions About OBD2 Scanners

What exactly is an OBD2 Scanner?

OBD2 scanners are diagnostic tools that mechanics and car owners use to communicate with a vehicle’s onboard computer system. Instead of manually dismantling parts to diagnose issues, mechanics connect an OBD2 scanner to the car’s OBD port to access a wealth of diagnostic information.

In their most basic form, OBD2 scanners read and interpret Diagnostic Trouble Codes (DTCs) flagged by your car when it detects a problem. More advanced scanners can monitor vehicle systems in real-time, predict potential future issues, and even offer repair guidance. Think of them as translators, converting your car’s internal language into information you can understand.

Where is the OBD2 Port Located?

The On-Board Diagnostics Version Two (OBD2) port is a standardized connector found in virtually 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 standardization makes OBD2 scanners universally compatible with modern cars across these regions.

The OBD2 port is your gateway to your car’s computer. Beyond OBD2 scanners, other devices like insurance black boxes and dashcams can also utilize this port. If you’re unsure of its location, this guide to finding your car’s OBD2 port in North American vehicles can help. For vehicle owners outside North America, this resource explains how to locate your OBD2/EOBD port worldwide.

What is a DTC and Why is it Important?

DTC stands for Diagnostic Trouble Code. When a car’s onboard diagnostic system detects a problem, it generates a DTC – essentially an error code that signals a specific issue. OBD2 scanners read these DTCs, allowing users to pinpoint the source of the problem.

While there are numerous standardized DTCs common across vehicle makes and models, some manufacturers also utilize proprietary DTCs specific to their vehicles. Understanding DTCs is crucial for effective car diagnostics and repair.

How to Decipher DTC Error Codes?

DTCs may initially seem like random alphanumeric strings, but they follow a logical structure that reveals information about the detected problem. Understanding this structure can provide valuable clues about the issue.

• First Character (Letter): Indicates the affected vehicle system:

  • P: Powertrain (engine, transmission)
  • B: Body (interior, comfort, safety systems)
  • C: Chassis (braking, steering, suspension)
  • U: Network/Undefined (communication systems)

• Second Character (Number): Specifies code type:

  • 0: Generic code (standardized across manufacturers)
  • 1: Manufacturer-specific code (unique to a particular brand)

• Third Character (Number or Letter): Identifies the specific 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 control and idle control systems
  • 6: Computer auxiliary outputs
  • 7, 8, 9: Transmission and gearbox faults
  • A, B, C: Hybrid-specific propulsion system faults

• Fourth and Fifth Characters (Numbers): Pinpoint the exact fault within the subsystem (ranging from 00 to 99).

OBD2 scanners translate these DTCs into understandable descriptions. Advanced scanners often provide more detailed information and potential repair steps. While scanners offer guidance, online resources like Google can further assist in DTC interpretation, given the vast database of over 5,000 possible DTCs. It’s important to note that not all DTCs indicate critical issues; some may simply signal minor anomalies like slightly elevated engine temperature.

How to Choose the Best OBD2 Scanner for Your Needs

When seeking insights into your car’s performance or diagnosing a check engine light, an OBD2 scanner is an indispensable tool. It empowers you with the same diagnostic information used by dealerships and repair shops, putting you in control of your car’s maintenance.

OBD2 scanners come in two primary types:

• Handheld OBD2 Scanners: These standalone devices feature an integrated screen and a cable for direct connection to your car’s OBD port.

• Wireless OBD2 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-performing OBD2 scanners are available across various price points. The best OBD2 scanner for you will depend on your specific needs and priorities. Key factors to consider include:

• Ease of Setup: A scanner should be quick and easy to set up, allowing for prompt diagnostics when needed.

• Fault Code Explanation: The best OBD2 scanners not only display fault codes but also provide clear explanations of their meaning, enabling informed decisions about repair.

• I/M Readiness Check: A valuable feature for emissions testing, this function verifies if your car will pass state inspections.

• Accuracy: Accurate readings are paramount. Incorrect information is detrimental, making accuracy a non-negotiable factor in a reliable scanner.

• Size and Weight: Portability matters. A compact and lightweight scanner is more likely to be kept in your car for on-the-go diagnostics.

• Live Data: Real-time data streaming of engine parameters (speed, timing, etc.) is crucial for tracking down intermittent issues.

• Graphing Capability: Visual data representation through graphs enhances data interpretation, especially for comparative analysis.

• Warranty and Updates: Longevity is key. Look for scanners with robust warranties and software update options to ensure continued compatibility with evolving automotive technology. Lifetime warranties are a significant advantage.

When choosing the best OBD2 scanner, consider whether you prefer the standalone convenience of a handheld unit or the smartphone integration of a wireless scanner. Prioritize features that align with your diagnostic needs and technical expertise. For handheld scanners, prioritize screen size and clarity for easy readability. Ruggedized scanners with shock-absorbing bumpers are ideal for demanding environments. Consider extra features like electrical multimeters, manufacturer-specific code reading, and data export capabilities. Ultimately, a well-chosen OBD2 scanner is a cost-effective investment, often priced less than an hour of professional mechanic labor, empowering you with valuable diagnostic capabilities.

How We Test OBD2 Scanners: Our Methodology

To rigorously evaluate OBD2 scanners, we employ a hands-on testing approach over several weeks, using a 2014 Audi A4 Allroad as our primary test vehicle in diverse driving conditions. Our testing process involves:

1. VIN Verification: We begin by ensuring each scanner accurately reads and reports the vehicle’s Vehicle Identification Number (VIN), confirming basic connectivity and identification.

2. Connectivity Assessment: For wireless scanners, we test Bluetooth and Wi-Fi connection stability and range with devices like Apple iPads, Microsoft Surfaces, and Samsung Galaxy smartphones. Handheld scanners are assessed for cable length and ease of connection.

3. Live Data Monitoring: With the engine running, we monitor real-time engine parameters and vital systems to evaluate data streaming capabilities and responsiveness.

4. Fault Code Generation and Reading: To test fault code reading accuracy, we intentionally disconnect the engine’s oil temperature sensor, triggering a check engine light and generating a fault code.

5. Fault Code Interpretation and Clearing: We assess the scanner’s ability to accurately identify and explain the generated fault code. We then verify the scanner’s functionality in clearing the fault code and turning off the check engine light after reconnecting the sensor.

6. Road Testing and Data Display: We conduct road tests to evaluate the scanner’s ability to display live operating data such as engine speed, timing, and coolant temperature under real-world driving conditions. We assess data presentation formats, including numeric displays, graphs, and simulated gauges, prioritizing user-friendliness and clarity.

7. Code Type Analysis: We analyze the scanner’s handling of both generic (P0xxx) and manufacturer-specific (P1xxx) fault codes, ensuring accurate interpretation and differentiation. We use examples like P0098 (generic intake air temperature sensor issue) and Ford P1112 (manufacturer-specific intermittent IAT sensor fault) to test code specificity.

Through this comprehensive testing methodology, we strive to provide you with data-driven and reliable recommendations for choosing the best OBD2 scanner for your automotive diagnostic needs.

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