Unlocking the secrets hidden within your car’s onboard computer is easier than ever with the right OBD2 scanner. These ingenious devices act as a vital bridge, granting you direct access to your vehicle’s health information, empowering you to understand and address issues from the comfort of your own garage. Whether you’re faced with a perplexing dashboard light or suspect a deeper mechanical problem, the best OBD2 scanners equip you to diagnose the situation efficiently, potentially saving you significant costs on professional mechanic fees.
Navigating the world of OBD2 scanners can be daunting, especially for beginners. The market is saturated with options, each boasting different features and capabilities. Having rigorously tested a wide array of OBD2 scanners over the years, we’ve compiled a list of top recommendations to guide you towards the perfect tool for your needs. Below, we’ll not only reveal our top picks but also delve into the mechanics of OBD2 scanners, deciphering error codes and empowering you with the knowledge to make informed decisions about your car’s maintenance.
Among our standout selections, the Topdon TopScan emerges as the best mobile OBD2 scanner, offering seamless wireless connectivity and a surprisingly robust suite of diagnostic features within its compact design. For budget-conscious users, the Launch CR529 stands out as the best cheap OBD2 scanner, delivering impressive functionality at an incredibly accessible price point. And for those seeking professional-grade diagnostics, the Topdon Phoenix Lite 2, though a premium investment, provides an unparalleled diagnostic experience akin to what professionals use.
Here are our expertly tested and reviewed top picks for the best OBD2 scanners available today, ensuring you can find the ideal tool to keep your vehicle running smoothly.
Tom Pritchard
Tom is the Tech Editor, with extensive experience reviewing a wide range of consumer electronics, including car tech and diagnostic tools. He is passionate about empowering car owners with the knowledge and tools to understand and maintain their vehicles.
The Quick List: Top OBD2 Scanners at a Glance
For those in a hurry, here’s a quick rundown of the best OBD2 scanners we recommend. Scroll further down for detailed reviews of each product and a comprehensive guide to understanding OBD2 scanners.
Topdon TopScan Mobile OBD2 Scanner
1. Topdon TopScan: Best Mobile OBD2 Scanner
Effortless Bluetooth setup and professional-grade features packed into a compact design make the Topdon TopScan our top mobile pick. Enjoy comprehensive diagnostics, repair guidance, parts information, and even predictive analysis to anticipate potential issues.
Dive Deeper into the Topdon TopScan
Launch CR529 OBD2 Scanner on White Background
2. Launch CR529: Best Cheap OBD2 Scanner
The Launch CR529 punches above its weight, offering essential OBD2 scanner functions alongside higher-end features rarely found in its price range. Benefit from lifetime support and updates, making it an unbeatable value proposition.
Explore the Value of the Launch CR529
Topdon Phoenix Lite 2 OBD2 Scanner and Tablet
3. Topdon Phoenix Lite 2: Best Professional-Level OBD2 Scanner
With its robust design and tablet interface, the Topdon Phoenix Lite 2 delivers a near-professional diagnostic experience. Built for both enthusiasts and professionals, it’s a powerful scanner capable of handling demanding diagnostic tasks.
Discover the Power of the Topdon Phoenix Lite 2
Ancel BD310 Dual-Purpose OBD2 Scanner
4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
The Ancel BD310 offers versatility, functioning as both an OBD2 scanner and a supplementary dashboard display. Its compact design, smartphone compatibility, and affordable price make it a compelling choice.
Learn More About the Ancel BD310’s Dual Functionality
Carly OBD2 Scanner with Companion App
5. Carly OBD2 Scanner: Best OBD2 Scanner with Companion App
The Carly OBD2 Scanner shines with its exceptional companion app, offering a user-friendly interface and advanced customization. Maximize its potential with compatible vehicles like VW, BMW, and Ford to access a wide range of features and professional-level tests.
Explore the App-Driven Experience of the Carly OBD2 Scanner
Deep Dive: Exploring the Best OBD2 Scanners
Why Trust Tom’s Guide? Our commitment to rigorous testing and unbiased reviews ensures you receive dependable recommendations. Our team of experts dedicates countless hours to evaluating products, services, and apps, striving to identify the very best options available. Learn more about our testing methodology and review process.
1. Topdon TopScan: Best Mobile OBD2 Scanner
(Image credit: Topdon)
Perfect for Deep Car Diagnostics
Expert Review: Topdon TopScan Review
Key Specifications:
- Display: None (App-based)
- Connectivity: Bluetooth
- Handheld: No
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: None (App-controlled)
- Warranty: 2 years
- Dimensions: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Exceptional diagnostic coverage
- Comprehensive live data stream
- Unique performance indicators (horsepower, torque estimation)
- Wide range of maintenance functions
Reasons to Avoid:
- Larger and heavier transmitter than some competitors
- Advanced features may require subscription after the first year
Don’t let its unassuming appearance fool you – the Topdon TopScan is a powerhouse in a small package. This Bluetooth OBD2 scanner transcends basic error code reading, offering a suite of features often found in more expensive, professional-grade tools. Its seamless Bluetooth connectivity pairs effortlessly with your smartphone, transforming it into a sophisticated diagnostic command center.
Beyond standard fault detection and I/M Readiness tests, the TopScan delves deeper, analyzing vehicle performance and efficiency. It can even estimate horsepower and torque figures, providing valuable insights for car enthusiasts and those seeking to optimize their vehicle’s performance. Whether you’re aiming to fine-tune your engine or ensure roadworthiness, the Topdon TopScan is an invaluable addition to any toolkit.
Read our full Topdon TopScan review for an in-depth analysis.
2. Launch CR529: Best Cheap OBD2 Scanner
(Image credit: Future)
Unbeatable Value Under $50
Expert Review: Launch CR529 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
- 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 generation
Reasons to Avoid:
- Lacks manufacturer-specific diagnostic codes
- Feels somewhat heavy for its size
- Limited 1-year warranty
The Launch CR529 redefines “value” in the OBD2 scanner market. Priced under $50, it delivers a surprising level of diagnostic capability that rivals scanners at twice the cost. Its user-friendly interface and robust feature set make it an ideal choice for budget-conscious car owners who don’t want to compromise on essential diagnostic functions.
While concessions are made to achieve its low price point – such as the absence of manufacturer-specific codes and a slightly hefty feel – the CR529 still provides crucial features like live data monitoring, instant inspection readiness checks, and comprehensive insights into your vehicle’s systems. Lifetime free updates ensure your scanner remains current, offering long-term value without recurring subscription fees.
While not tailored for professional mechanics, the Launch CR529 is an exceptional choice for everyday car owners seeking a reliable and affordable OBD2 scanner for routine diagnostics and maintenance.
Read our comprehensive Launch CR529 review for a deeper dive.
3. Topdon Phoenix Lite 2: Best Professional-Level OBD2 Scanner
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(Image credit: Future)
Bridging the Gap Between Amateur and Professional Diagnostics
Expert Review: Topdon Phoenix Lite 2 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
- Warranty: 2 years
- Dimensions: 10.2 x 7.2 x 1.7 inches
- Weight: 2.6 pounds
Reasons to Buy:
- Professional-grade OBD2 scanner capabilities
- Hybrid handheld design with Wi-Fi and Bluetooth
- Large 8-inch touchscreen display
- Extensive suite of diagnostic tests and live data options
- Includes adapters and a protective hard case
Reasons to Avoid:
- Bulky and heavy, potentially cumbersome
- Higher price point compared to other scanners
- Subscription required for updates after two years
The Topdon Phoenix Lite 2 commands a premium price, but it justifies the investment with a feature set that blurs the lines between amateur and professional diagnostic tools. Designed for both serious DIYers and professional mechanics, this scanner delivers exceptional performance and versatility.
Its wireless design, featuring a Bluetooth-connected control pad, provides unparalleled freedom of movement around the vehicle. The robust, workshop-ready construction, complete with a kickstand, ensures durability in demanding environments. The large 8-inch touchscreen offers a clear and intuitive interface for navigating its extensive features.
The Phoenix Lite 2 boasts advanced capabilities, including live data graphing, detailed fault code information, and a wide array of specialized diagnostic functions that surpass the reach of most budget scanners. While firmware updates require a subscription after the initial two years, the comprehensive features and robust build quality make the Topdon Phoenix Lite 2 a worthwhile investment for those seeking top-tier diagnostic capabilities.
Read our full Topdon Phoenix 2 Lite review for a comprehensive assessment.
4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
Ancel BD310 (Image credit: Tom’s Guide)
OBD2 Scanner and Secondary Car Display in One
Expert Review: Ancel BD310 Review
Key Specifications:
- Display: 2-inch Color Screen
- Connectivity: Bluetooth
- Handheld: Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: 4
- Warranty: 3 years
- Dimensions: 5.1 x 2.4 x 0.6 inches
- Weight: 5.4 ounces
Reasons to Buy:
- Lightweight and highly portable
- Functions as both an OBD2 scanner and a secondary car display
- Offers both handheld and Bluetooth scanning options
Reasons to Avoid:
- Minimalist interface may lack visual appeal for some
- Small 2-inch screen
The Ancel BD310 distinguishes itself with its dual-purpose functionality. Beyond its capabilities as a standard OBD2 scanner, it can also serve as a supplementary display, providing real-time engine data directly in your car’s cabin when connected via Bluetooth to your smartphone.
Its compact and lightweight design makes the BD310 incredibly convenient to store in your glovebox, ensuring it’s always readily accessible. While the 2-inch display 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 56-inch cable offers ample reach for comfortable use while working under the hood. The BD310 effectively performs essential OBD2 functions, including I/M readiness checks and displaying crucial performance data such as coolant temperature, engine timing, and RPM.
Read our detailed Ancel BD310 review for a complete analysis.
5. Carly OBD2 Scanner: Best OBD2 Scanner with Companion App
(Image credit: Carly)
App-Driven Diagnostics with Exceptional User Experience
Expert Review: Carly OBD Scanner Review
Key Specifications:
- Display: None (App-based)
- Connectivity: Bluetooth
- Handheld: No
- I/M Readiness Test: No
- Live Data Display: Yes
- Keys: None (App-controlled)
- Warranty: Lifetime
- Dimensions: 2.9 x 1.5 x 0.7 inches
- Weight: 0.7 ounces
Reasons to Buy:
- User-friendly and intuitive app interface
- Extensive customization options within the app
- Real-time live data display
- Covers maintenance and repair functions
- Lifetime warranty and software updates
Reasons to Avoid:
- Feature availability varies depending on car make and model
- Full app functionality requires a subscription, which can become expensive
The Carly OBD2 Scanner truly shines due to its exceptional companion app. While many Bluetooth OBD2 scanners offer basic app interfaces, Carly provides a polished, feature-rich, and highly user-friendly app experience that elevates the entire diagnostic process.
Beyond basic fault code reading and clearing, the Carly app offers repair guidance, used car check features to identify potential problems before purchasing, and extensive customization options to tailor the app to your specific needs. The lifetime warranty adds further peace of mind.
However, it’s crucial to note that feature availability is car-dependent, with VW, BMW, and Ford vehicles enjoying the most comprehensive functionality. Unlocking the full potential of the Carly app, beyond basic OBD2 functions, requires an ongoing subscription, which can represent a recurring cost.
Explore our full Carly OBD scanner review to learn more about its app-driven features.
Other OBD2 Scanners We’ve Tested:
- Innova CarScan Mobile 1000 (★★★★☆): This Bluetooth scanner stands out for its innovative predictive diagnostics and remarkably simple setup. It delivers impressive Innova features wirelessly through your smartphone. Read the full Innova CarScan Mobile 1000 review.
- ThinkCar ThinkDiag TKD01 (★★★★☆): While larger than typical Bluetooth OBD2 scanners, the TKD01 boasts exceptional durability and offers a wealth of manufacturer-specific error codes. It can even resolve minor faults without mechanic intervention, though a subscription is required after the first year. Read our full ThinkCar ThinkDiag TKD01 review.
- Autel AutoLink AL539 (★★★☆☆): Specifically designed for diagnosing electrical issues, this OBD2 scanner includes a built-in multimeter. It excels at pinpointing electrical faults like burnt cables and short circuits. Read our full Autel AutoLink AL539 review.
Frequently Asked Questions About OBD2 Scanners
What is an OBD2 Scanner?
OBD2 scanners are diagnostic tools that mechanics, and increasingly car owners, use to understand a vehicle’s health. Instead of manual inspection, these scanners plug into your car’s OBD port, accessing the onboard computer’s data to identify problems.
At their core, OBD2 scanners read and interpret error codes flagged by your car when it detects an issue. Advanced models go further, monitoring systems in real-time and even predicting potential future problems. The best OBD2 scanners empower you with valuable insights into your vehicle’s condition.
What is the OBD2 Port?
The On-Board Diagnostics Version Two (OBD2) 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 other regions including Australia and New Zealand since 2006.
This port serves as the connection point for interfacing with your car’s onboard computer. Various devices can utilize the OBD2 port, including OBD2 scanners, insurance telematics devices, and dashcams.
If you’re unsure of your OBD2 port’s location, find your car’s OBD2 port location for North American vehicles or find your OBD2/EOBD port worldwide.
What is a DTC?
DTC stands for Diagnostic Trouble Code. These are error codes generated by your car’s OBD system when it detects a malfunction. OBD2 scanners read these codes, allowing users to diagnose vehicle issues. While many DTCs are standardized across vehicle makes and models, some manufacturers use proprietary DTCs specific to their vehicles.
Understanding DTCs: Deciphering Error Codes
DTCs may appear cryptic at first glance, composed of seemingly random letters and numbers. However, they follow a logical structure providing clues about the nature of the problem.
The first character indicates the affected vehicle system:
- P – Powertrain (engine, transmission)
- B – Body (interior, comfort, safety systems)
- C – Chassis (braking, suspension, steering)
- N – Network (communication systems)
The second character is a digit indicating code type:
- 0 – Generic code (standardized across manufacturers)
- 1 – Manufacturer-specific code (unique to a particular brand)
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
- 6 – Computer auxiliary outputs
- 7, 8, 9 – Transmission and gearbox faults
- A, B, C – Hybrid propulsion system faults
The fourth and fifth characters are numbers (00-99) providing further detail about the specific fault.
OBD2 scanners translate these codes into understandable descriptions. Advanced scanners offer more in-depth information, but online resources like Google can also help decipher DTCs. With over 5,000 possible DTCs, understanding their structure is a valuable diagnostic skill. It’s important to remember that not all DTCs indicate critical problems; some may simply signal minor issues like slightly elevated engine temperature.
Choosing the Best OBD2 Scanner: Key Considerations
For gaining valuable insights into your vehicle’s operation and diagnosing potential problems, using one of the best OBD2 scanners is an unmatched approach. It’s the same method dealerships and repair shops employ, putting the power of diagnosis in your hands.
OBD2 scanners are broadly categorized into two types:
- Handheld OBD2 scanners: These standalone devices feature an integrated screen and a cable for direct connection to the OBD port.
- Wireless OBD2 scanners: These plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for displaying diagnostic information.
Regardless of the type, numerous high-performing OBD2 scanners are available for under $200, with some costing even less than $30. The ideal OBD2 scanner balances size, ease of use, and the ability to accurately read fault codes and live data. Key criteria to consider include:
- Easy Setup: A scanner should be quick and straightforward to set up, encouraging frequent use for early problem detection.
- Fault Code Explanation: The best scanners not only display fault codes but also provide clear explanations, enabling DIY repairs or informed communication with mechanics.
- I/M Readiness Check: A valuable feature for emissions testing, this verifies if your vehicle will pass state inspections.
- Accuracy: Reliable results are paramount; inaccurate information is worse than no information at all.
- Size and Weight: A compact and lightweight scanner is more likely to be kept in the car for on-the-go diagnostics.
- Live Data: Access to real-time engine parameters (speed, timing, etc.) is crucial for tracking down intermittent issues.
- Data Graphs: Visual representations of data, like graphs, enhance understanding and facilitate before-and-after comparisons.
- Warranty: Look for scanners with robust warranties, ideally lifetime warranties or extended coverage to ensure long-term value.
Choosing between a Bluetooth or handheld scanner depends on personal preference. Consider factors like screen size (for handhelds), desired features, and budget. Lifetime updates and warranties are significant advantages, ensuring your scanner remains compatible with evolving automotive technology. For handheld scanners, prioritize screen clarity and ease of navigation. Ruggedized models with shock absorption are beneficial for clumsy users or workshop environments.
Additional features like built-in multimeters, manufacturer-specific code reading, and PDF report generation can further enhance functionality. The affordability of sophisticated OBD2 scanners, often under $100, makes them a cost-effective investment, potentially saving you significant mechanic labor costs in the long run.
How We Test OBD2 Scanners: Rigorous Evaluation
Our OBD2 scanner testing process involves real-world usage over several weeks using a 2014 Audi A4 Allroad. Each scanner undergoes thorough evaluation in both garage and on-road scenarios. Initial steps include verifying VIN reporting and establishing Bluetooth or Wi-Fi connections for wireless models using devices like Apple iPads, Microsoft Surfaces, and Samsung Galaxy smartphones. Handheld scanners are tested for cable length and ease of handling.
With the vehicle running, we monitor engine and vital systems. A controlled fault is then introduced by disconnecting the engine oil temperature sensor to assess fault code detection and accuracy. We evaluate the scanner’s ability to provide detailed fault information, clear codes after issue resolution, and subsequently monitor live operating data such as engine speed, timing, and coolant temperature during test drives. Data presentation (numerical values, graphs, gauges) is also assessed for clarity and user-friendliness.
Our evaluation rigorously tests each scanner’s ability to accurately diagnose and display vehicle data, ensuring our recommendations highlight the best OBD2 scanners based on performance and real-world usability.
Understanding Fault Codes: Decoding the Language of Your Car
OBD2 fault codes, or DTCs, consist of five characters: a letter followed by four numbers. The letter prefix categorizes the affected system: Powertrain (P), Body (B), Chassis (C), or Undefined (U).
Within the numeric portion, codes starting with ‘0’ are generic, applying across all makes, while codes beginning with ‘1’ are manufacturer-specific, indicating unique hardware or in-depth analysis. For example, a P0098 code typically points to an issue with the intake air temperature sensor. Conversely, a Ford-specific P1112 code for the same sensor suggests intermittent readings requiring sensor replacement. Understanding this code structure empowers users to interpret diagnostic information effectively and take appropriate action.
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