For modern car owners, understanding your vehicle’s health is no longer a mystery hidden under the hood. Thanks to onboard computer systems and OBD-II scanners, you can now access a wealth of diagnostic information right at your fingertips. Whether you’re facing a perplexing dashboard light or simply want to stay ahead of potential issues, an OBD-II scanner is an invaluable tool. It acts as a bridge to your car’s computer, allowing you to decipher problems without the immediate need for a mechanic, saving you both time and money.
However, the world of OBD-II scanners can be overwhelming. With countless options available, finding the right one can feel like navigating a maze, especially for those new to car diagnostics. We understand this challenge. Over years of hands-on testing and in-depth reviews, we’ve rigorously evaluated a wide spectrum of OBD-II scanners. Our aim is to simplify your decision-making process and guide you towards the best car diagnostic tool for your specific needs.
From user-friendly wireless models to professional-grade scanners, we’ve explored the market to pinpoint the top performers. Are you looking for a budget-friendly option? Or perhaps a scanner packed with advanced features for in-depth analysis? This guide will delve into our top picks, highlighting their strengths and weaknesses to help you make an informed choice. Furthermore, for those curious about the inner workings, we’ll break down how OBD-II scanners function and demystify those often-intimidating error codes.
Below are our expertly selected recommendations for the best OBD-II scanners currently available for purchase.
Tom Pritchard
Tom is the UK Phones Editor for Tom’s Guide, bringing expertise in hardware and mobile tech. A passionate advocate for electric vehicles, he combines tech knowledge with automotive enthusiasm.
The Best OBD-II Scanners at a Glance
Based on our rigorous hands-on testing, here’s a quick rundown of the top OBD-II scanners you can buy today. For detailed insights into each scanner and what sets them apart, simply scroll down.
Topdon TopScan Mobile OBD-II Scanner 1. Topdon TopScan: Best Mobile OBD-II Scanner
The Topdon TopScan stands out for its effortless Bluetooth setup and a suite of professional-grade features packed into a compact design. Beyond basic diagnostics, it offers repair guidance, parts information, and even predictive analysis to anticipate potential issues.
Explore the Topdon TopScan in Detail
Launch CR529 OBD-II Scanner for Budget-Conscious Users 2. Launch CR529: Best Cheap OBD-II Scanner
The Launch CR529 is a powerhouse in a small package, delivering essential OBD-II scanner functions alongside premium features typically found in higher-priced models. Benefit from lifetime support and updates, making it an exceptional value.
Discover Why the Launch CR529 is Budget-Friendly and Feature-Rich
Topdon Phoenix Lite 2 Rugged Professional OBD-II Scanner 3. Topdon Phoenix Lite 2: Best Professional-Level OBD-II Scanner
Resembling a robust handheld console, the Topdon Phoenix Lite 2 boasts a rugged design and professional capabilities. Designed for both seasoned mechanics and DIY enthusiasts, it offers advanced diagnostics in a durable form factor.
Learn More About the Professional Capabilities of the Topdon Phoenix Lite 2
Ancel BD310 Dual-Purpose OBD-II Scanner and Dashboard Display 4. Ancel BD310: Best Dual-Purpose OBD-II Scanner
The Ancel BD310 is a versatile tool that functions as both a standard OBD-II scanner and an auxiliary dashboard display for real-time engine data. Its sleek design, smartphone compatibility, and affordable price make it a standout choice.
See How the Ancel BD310 Offers Dual Functionality
Carly OBD-II Scanner with Companion App for Enhanced Features 5. Carly OBD-II Scanner: Best OBD-II Scanner with a Companion App
The Carly OBD-II Scanner’s value is amplified by its exceptional companion app. Particularly beneficial for VW, BMW, and Ford owners, it provides extensive customization and professional-level diagnostic tests.
Explore the App-Enhanced Experience of the Carly OBD-II Scanner
Deep Dive into the Best OBD-II Scanners: Find Your Perfect Tool
Why Trust Tom’s Guide? Our commitment to you is unwavering. Our team of writers and editors dedicate countless hours to hands-on product testing, meticulous analysis, and thorough reviews. This rigorous process ensures we bring you dependable recommendations to help you make the best choices. Learn more about our testing methodology and rating system.
1. Topdon TopScan: Best Mobile OBD-II Scanner for Comprehensive Diagnostics
(Image credit: Topdon)
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Topdon TopScan
Perfect for unlocking your car’s hidden potential with in-depth diagnostics.
Our Expert Review
Key Specifications:
- Display: None (Smartphone App-Based)
- 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 Coverage: Offers exceptional depth in automotive diagnostics.
- Real-time Live Data: Provides access to crucial engine parameters in real-time.
- Performance Metrics: Unique capability to assess vehicle performance and efficiency.
- Maintenance Features: Covers a broad spectrum of maintenance-related checks and resets.
Reasons to Avoid:
- Size of Transmitter: The Bluetooth transmitter module is relatively large and may feel somewhat heavy.
- Subscription for Full Features: Some advanced functionalities require a subscription after the initial year.
Don’t let its unassuming appearance fool you – the Topdon TopScan is a powerhouse of diagnostic capabilities packed into a compact Bluetooth scanner. This isn’t just a basic OBD-II module that streams data to your smartphone. In our testing, the TopScan significantly exceeded the capabilities of other scanners in its class, offering features typically found in much more expensive professional tools.
Beyond simply reading fault codes and performing I/M Readiness tests, the TopScan excels in performance and efficiency analysis. It can even estimate your vehicle’s horsepower and torque – features rarely seen in OBD-II scanners, especially in this price range. Whether you’re a car enthusiast looking to fine-tune your vehicle’s performance or a practical owner focused on maintaining roadworthiness, the Topdon TopScan is an invaluable addition to your toolkit.
Read our comprehensive Topdon TopScan Review to delve deeper into its features and performance.
2. Launch CR529: Best Cheap OBD-II Scanner for Incredible Value
(Image credit: Future)
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Launch CR529
The best OBD-II scanner under $50, offering exceptional features for the price.
Our Expert Review
Key Specifications:
- Display: 2.8-inch Color Screen
- Connectivity: Cable Connection
- 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:
- Unbeatable Price: Exceptionally inexpensive, making it accessible to all car owners.
- Lifetime Free Updates: Ensures the scanner remains current with the latest vehicle technology and diagnostic capabilities.
- Pre-Inspection Report: Simplifies vehicle inspection readiness checks.
Reasons to Avoid:
- Limited Manufacturer-Specific Codes: May lack some specialized codes specific to certain car manufacturers.
- Heavier Build: Feels somewhat heavy in hand compared to more compact scanners.
- Shorter Warranty: Offers a 1-year warranty, shorter than some competitors.
In our opinion, the Launch CR529 redefines “value” in the OBD-II scanner market. Its remarkably low price point of under $50 is just the beginning. The level of diagnostic functionality it delivers for this cost is truly surprising. We were genuinely impressed by the features packed into such an affordable device.
While compromises are expected at this price, they are minimal. The CR529 doesn’t support manufacturer-specific advanced codes and has a slightly heavier feel. However, it compensates with essential features like live data streaming, an instant vehicle inspection function, and a surprisingly detailed view into your car’s systems. The inclusion of lifetime free updates is a significant advantage, ensuring long-term usability without subscription fees.
The CR529 might not cater to professional mechanics seeking advanced features, but for the average car owner, it’s an outstanding tool to have in your garage. It offers a fantastic balance of affordability and functionality.
Read our in-depth Launch CR529 Review to learn more about its impressive features and value.
3. Topdon Phoenix Lite 2: Best Professional-Level OBD-II Scanner for Advanced Diagnostics
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(Image credit: Future)
Topdon Phoenix Lite 2
Bridging the gap between DIY enthusiasts and professional mechanics with its advanced capabilities.
Our Expert Review
Key Specifications:
- Display: 8-inch Color Touchscreen
- Connectivity: Bluetooth and 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:
- Near-Professional Grade: Offers diagnostic capabilities approaching those of professional-level scanners.
- Versatile Connectivity: Combines handheld convenience with wireless Bluetooth and Wi-Fi capabilities.
- Large Touchscreen: Features a generous 8-inch touchscreen for easy navigation and data viewing.
- Extensive Diagnostics and Live Data: Provides a comprehensive suite of diagnostic tests and real-time data parameters.
- Comprehensive Kit: Includes adapters and a protective hard case for storage and transport.
Reasons to Avoid:
- Bulky and Heavy: Its size and weight can make it less convenient compared to smaller scanners.
- High Price Point: More expensive than many other capable OBD-II scanners on the market.
- Subscription After 2 Years: Firmware updates require a paid subscription after the initial 2-year period.
The Topdon Phoenix Lite 2 occupies a unique space in the OBD-II scanner market. While it comes with a higher price tag than many other scanners, it delivers an exceptional array of features that justify the investment. It’s designed to appeal to both serious DIY car enthusiasts and professional mechanics seeking a powerful and versatile diagnostic tool.
One of the standout features is its wireless operation. The control tablet connects via Bluetooth to a compact receiver plugged into your car’s OBD port, providing unparalleled freedom of movement around the vehicle. Despite its robust build, the scanner includes a kickstand and ruggedized design, making it well-suited for demanding workshop environments.
The Phoenix Lite 2 goes beyond basic code reading, offering advanced functionalities like live data graphing, detailed fault code information, and numerous specialized tests typically found in professional diagnostic systems. However, it’s important to note that after the initial 2-year period, firmware updates require an annual subscription fee.
Read our detailed Topdon Phoenix Lite 2 Review for a complete understanding of its professional-grade features and performance.
4. Ancel BD310: Best Dual-Purpose OBD-II Scanner for Dashboard Integration
Ancel BD310 (Image credit: Tom’s Guide)
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Ancel BD310
A versatile OBD-II scanner that doubles as a secondary car display, offering unique functionality.
Our Expert Review
Key Specifications:
- Display: 2-inch Color Screen
- Connectivity: Bluetooth and Cable Connection
- 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: Extremely portable and easy to store in a glovebox.
- Dual Functionality: Operates as both an OBD-II scanner and a secondary car display.
- Flexible Connectivity: Supports both handheld and Bluetooth smartphone connection.
Reasons to Avoid:
- Minimalist Interface: The user interface is quite basic and may lack visual appeal.
- Small Screen Size: The 2-inch display can feel cramped for viewing detailed data.
The Ancel BD310 distinguishes itself with its innovative dual-purpose design. It functions effectively as a standard handheld OBD-II scanner but also offers a unique capability: when connected via Bluetooth to your smartphone, it can transform into a secondary display, showing real-time engine parameters directly in your car’s cabin.
Its compact and lightweight design makes the BD310 exceptionally convenient to keep in your vehicle. It’s small enough to store in your glove compartment, ensuring it’s always readily available. While the 2-inch screen is on the smaller side, and the four-button interface is somewhat basic, these design choices contribute to its portability without significantly hindering its diagnostic capabilities.
The BD310’s 56-inch cable provides ample reach for comfortable use while working under the hood. It performs essential OBD-II functions, including I/M readiness checks and displaying crucial performance data like coolant temperature, engine timing, and RPM.
Explore our full Ancel BD310 Review to discover more about its unique features and dual-purpose functionality.
5. Carly OBD-II Scanner: Best Companion App for Enhanced User Experience and Customization
(Image credit: Carly)
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Carly OBD-II Scanner
A scanner that’s truly enhanced by its exceptional companion app, offering a rich user experience.
Our Expert Review
Key Specifications:
- Display: None (Smartphone App-Based)
- 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:
- User-Friendly App: Features an exceptionally intuitive and well-designed companion app.
- Customization Options: Offers extensive customization and personalization features through the app.
- Live Data and Repairs: Provides real-time data monitoring and repair guidance.
- Comprehensive Coverage: Includes maintenance and repair functions within the app.
- Lifetime Warranty: Offers a rare lifetime warranty, demonstrating long-term product confidence.
Reasons to Avoid:
- Vehicle Compatibility: Feature availability is heavily dependent on your specific car make and model.
- Subscription Costs: Access to advanced features beyond basic OBD-II functionality requires an ongoing subscription.
The Carly OBD-II Scanner stands out not just for its hardware, but especially for the quality of its companion app. While many Bluetooth scanners offer basic apps, Carly provides one of the most feature-rich and user-friendly app experiences we’ve encountered.
The app excels in diagnosing issues, clearing fault codes, and, uniquely, offering repair assistance to guide you through fixing problems. It also includes valuable tools for evaluating used cars, helping you avoid purchasing a problematic vehicle. The lifetime warranty is a significant benefit, reflecting the brand’s commitment to product longevity.
However, the Carly scanner’s capabilities are heavily influenced by your car’s make and model. Certain features and advanced diagnostics are optimized for brands like VW, BMW, and Ford. Furthermore, while the app’s basic OBD-II functions are free, accessing its full potential, including advanced diagnostics and customization, requires a subscription.
Explore our complete Carly OBD-II Scanner Review to understand its app-driven features and vehicle compatibility considerations.
Other OBD-II Scanners We’ve Tested and Evaluated
Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a forward-thinking Bluetooth OBD-II scanner that carries on Innova’s tradition of innovative features, including predictive diagnostics. Operating wirelessly through your smartphone, it combines ease of use with powerful diagnostic capabilities. The setup process is remarkably simple, making it a highly accessible Bluetooth-only option.
Read the full Innova CarScan Mobile 1000 Review
ThinkCar ThinkDiag TKD01 (★★★★☆)
Despite being larger than typical Bluetooth OBD-II scanners, the ThinkCar ThinkDiag TKD01 prioritizes durability and robustness. It offers extensive manufacturer-specific error codes and advanced fault-code analysis, capable of resolving minor issues without requiring a mechanic. However, a subscription fee 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 system problems, enhanced by an integrated multimeter. It excels at identifying issues like damaged wiring, short circuits, and blown fuses. It also provides a wide range of live data and pre-inspection readiness checks.
Read our full Autel AutoLink AL539 Review
Frequently Asked Questions About OBD-II Scanners
What exactly is an OBD-II Scanner?
Ever wondered how mechanics quickly pinpoint car problems? They don’t disassemble your engine piece by piece. Instead, they use a diagnostic scanner plugged into your car’s OBD port to access the onboard computer’s data.
At their core, OBD-II scanners read and interpret error codes generated by your car when it detects a problem. More advanced scanners offer real-time system monitoring and can even predict potential future issues, providing a proactive approach to car maintenance.
What is the OBD-II Port and Where to Find It?
The On-Board Diagnostics Version Two (OBD-II) port is a standardized interface found in almost all passenger vehicles sold in the US since 1996, Canada since 1998, the EU since 2004, and other regions like Australia, Mexico, and New Zealand since 2006.
This port serves as the connection point to your car’s onboard computer. Besides OBD-II scanners, it’s used for various devices, including insurance telematics, and increasingly, dash cameras.
If you’re unsure of your OBD-II port’s location, here’s a guide on finding your car’s OBD-II port for North American vehicles and worldwide OBD-II/EOBD port locations for other regions.
Understanding DTCs: Diagnostic Trouble Codes
DTC stands for Diagnostic Trouble Code. These are the error codes generated by your car’s OBD system when it detects a malfunction. OBD-II scanners read these codes, enabling users to diagnose vehicle problems. While many DTCs are standardized across vehicle makes and models, some manufacturers use proprietary DTCs specific to their vehicles.
Decoding DTCs: What Do Error Codes Mean?
DTCs can appear cryptic at first glance, a mix of letters and numbers seemingly without meaning. However, they follow a logical structure that can help you understand the nature of the detected issue.
The first character indicates the affected vehicle system: Powertrain (P), Body (B), Chassis (C), or Network/Communication (U). The second character is a number: (0) for a generic code (common across all manufacturers) or (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 Controls and Idle Control System
- 6: Computer Output Circuit
- 7, 8, 9: Transmission and Gearbox Faults
- A, B, C: Hybrid Propulsion System 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. Advanced models offer more in-depth information. While online resources like Google can help decode DTCs, remember there are thousands of potential codes.
Not all DTCs signal critical problems. While they flag significant issues, some codes may indicate minor concerns, like a slightly elevated engine temperature.
Choosing the Best Car Diagnostic Tool: Key Considerations
If you’re seeking insights into your car’s operation or diagnosing a problem, an OBD-II scanner is your best tool. It provides the same diagnostic access used by dealerships and repair shops, putting valuable information in your hands.
When choosing the best car diagnostic tool, understand that not all OBD-II scanners are created equal. There are two primary types:
Handheld OBD-II Scanners: These come with an integrated screen and cable for direct connection to your car’s OBD port.
Wireless OBD-II Scanners: These plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for displaying data.
Regardless of the type, many high-performing OBD-II scanners are available for under $200, with some budget options under $30. Key factors to consider when selecting the best OBD-II scanner include:
- Ease of Setup: A user-friendly setup ensures you’ll use the scanner promptly when needed.
- Fault Code Explanation: The best scanners not only display fault codes but also provide clear explanations, aiding in DIY repairs or informed communication with mechanics.
- I/M Readiness Check: A valuable feature for quickly assessing emissions system readiness for vehicle inspections.
- Accuracy: Reliable and accurate results are crucial for effective diagnostics.
- Size and Portability: Compact and lightweight scanners are more likely to be kept in your car for on-the-go diagnostics.
- Live Data Display: Real-time data monitoring is essential for tracking down intermittent issues.
- Data Visualization (Graphs): Visual data representation, like graphs, enhances data analysis, especially for before-and-after comparisons.
- Warranty and Updates: Consider scanners with robust warranties and software update options for long-term value.
Deciding between a handheld or wireless scanner and prioritizing features like ease of use, fault explanations, and warranty will guide you to the best OBD-II scanner for your needs.
Consider additional features like built-in multimeters, manufacturer-specific code reading, or PDF report generation. With sophisticated yet affordable options available for under $100, investing in a quality OBD-II scanner is a cost-effective decision compared to professional mechanic diagnostic fees.
Our OBD-II Scanner Testing Methodology
To ensure our OBD-II scanner recommendations are reliable and practical, we conduct rigorous testing. Our testing process involves:
Using a 2014 Audi A4 Allroad as our primary test vehicle over several weeks, both in the garage and on the road.
Verifying VIN (Vehicle Identification Number) reporting for each scanner after connecting it to the OBD-II port.
Testing wireless scanner connectivity with various devices, including Apple iPads, Microsoft Surface tablets, and Samsung Galaxy smartphones, via Bluetooth or Wi-Fi. Handheld scanners are tested via direct OBD-II port connection.
Measuring cable lengths for handheld scanners and wireless range for Bluetooth models.
Monitoring engine and vital systems in real-time with each scanner while the car is running.
Simulating a fault by disconnecting the engine’s oil temperature sensor to assess fault code detection and accuracy.
Evaluating the detail and clarity of fault code information provided by each scanner.
Using the scanner to clear the simulated fault, turn off the check engine light, and erase the error code.
Road testing to assess live operating data display, including engine speed, timing, and coolant temperature, noting data presentation formats (numbers, graphs, gauges).
Our comprehensive testing methodology ensures that our OBD-II scanner reviews are based on real-world performance and provide you with the information you need to choose the best car diagnostic tool.
Understanding OBD-II Fault Codes: A Quick Guide
All OBD-II fault codes consist of five characters: a letter followed by four numbers. The letter prefix indicates the system:
- P (Powertrain): Engine and transmission related codes.
- B (Body): Body electrical systems like power windows or seats.
- C (Chassis): Mechanical systems including braking, suspension, and steering.
- U (Undefined/Network): Communication network issues.
The numeric part of the code provides further detail. The first number after the letter indicates code type: 0 for generic (SAE standardized) codes common to all vehicles, and 1 for manufacturer-specific codes.
For example, a P0098 code typically indicates an issue with the intake air temperature sensor, a generic code applicable across car brands. Conversely, a P1112 code in a Ford vehicle, being manufacturer-specific, points to a more specific issue with the intake air temperature sensor – intermittent signal – suggesting sensor replacement.
By understanding this basic structure, and with the help of an OBD-II scanner to translate the codes, you can gain valuable insight into your vehicle’s health.
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