The best OBD2 scanner is an indispensable tool for any car owner wanting to understand their vehicle’s health. Modern cars are complex computers on wheels, and when that check engine light illuminates or something just doesn’t feel right, your car’s onboard diagnostic system likely knows why. An OBD2 scanner acts as your personal translator, accessing your car’s computer to reveal potential problems, saving you time and money on unnecessary mechanic visits.
However, with a market flooded with options, choosing the right OBD2 scanner can be daunting. Not all scanners are created equal; some are basic code readers, while others offer advanced features for in-depth diagnostics. As experts at TechCarUSA, we’ve rigorously tested a wide array of OBD2 scanners to bring you our top recommendations. Whether you’re a seasoned DIY mechanic or a novice car owner, our guide will help you find the best OBD2 scanner to meet your needs and budget.
Below, we delve into our top picks for the best OBD2 scanners available right now. We’ll also explain how OBD2 scanners function and demystify those perplexing error codes, empowering you to take control of your car’s maintenance.
Here are our top selections for the best OBD2 scanners you can purchase today.
Tom Pritchard
Tom is the TechCarUSA expert in automotive diagnostics and vehicle technology, with years of experience testing and reviewing car gadgets and tools. He is passionate about empowering car owners with the knowledge and equipment to maintain their vehicles effectively.
Quick List: Top OBD2 Scanners of 2024
Based on our hands-on testing and expert analysis, here are the best OBD2 scanners you can buy. Scroll down to explore detailed reviews and discover why these scanners earned their top spots.
Best Mobile Scanner
1. Topdon TopScan
The Topdon TopScan is the best mobile OBD2 scanner we tested, offering seamless Bluetooth connectivity and a suite of professional-grade diagnostic features in a compact design. It provides comprehensive diagnostics, repair guidance, parts information, and even predictive analysis to anticipate potential issues.
Best Cheap Scanner
2. Launch CR529
The Launch CR529 stands out as the best cheap OBD2 scanner, delivering exceptional value for money. For an affordable price, it includes essential OBD2 functions and even some higher-end features typically found in more expensive models. Lifetime support and updates further enhance its value.
Best Rugged Scanner
3. Topdon Phoenix Lite 2
The Topdon Phoenix Lite 2 is the best rugged OBD2 scanner, built for durability and professional use. Its robust design and comprehensive features make it ideal for both professional mechanics and serious DIY enthusiasts who need a scanner that can withstand demanding environments.
Best Dual-Purpose Scanner
4. Ancel BD310
The Ancel BD310 is recognized as the best dual-purpose OBD2 scanner, functioning effectively as both a handheld scanner and a supplementary dashboard display. Its versatility, smartphone compatibility, and reasonable price make it a top choice.
Best Scanner with Companion App
5. Carly OBD-II Scanner
The Carly OBD-II Scanner is the best OBD2 scanner with a companion app, offering a user-friendly experience and advanced customization, particularly for VW, BMW, and Ford vehicles. Its powerful app enhances its diagnostic capabilities and user experience.
What are the Best OBD2 Scanners?
At TechCarUSA, our reviews are built on rigorous testing and in-depth analysis to provide you with trustworthy recommendations. Learn more about our testing methodology.
Best Mobile OBD2 Scanner
(Image credit: Topdon)
1. Topdon TopScan
Perfect for Deep-Dive Car Diagnostics
Our Expert Review:
Specifications:
- Display/Size: None
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: None
- Warranty: 2 years
- Size: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Excellent automotive diagnostic coverage
- Comprehensive live data monitoring
- Unique performance indicators
- Maintenance item coverage
Reasons to Avoid:
- Bulky transmitter
- Subscription required for some features after the first year
Don’t let the unassuming appearance of the Topdon TopScan fool you. This compact device is more than just a basic Bluetooth OBD2 module. It surpasses many competitors in its class by offering advanced diagnostic capabilities beyond simply reading fault codes and running I/M Readiness tests.
The TopScan excels in performance and efficiency analysis, even estimating horsepower and torque – features often absent in scanners costing ten times as much. Whether you aim to optimize your car’s performance or ensure its roadworthiness, the Topdon TopScan is an invaluable addition to your toolkit.
Read our full Topdon TopScan review
Best Cheap OBD2 Scanner
(Image credit: Future)
2. Launch CR529
Unbeatable Value Under $50
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:
- Highly affordable
- Lifetime updates included
- Easy pre-inspection reporting
Reasons to Avoid:
- Lacks manufacturer-specific codes
- Feels somewhat heavy
- 1-year warranty
The Launch CR529 redefines value in OBD2 scanners. Its incredibly low price point doesn’t compromise its diagnostic capabilities. We were impressed by the range of features offered for such a budget-friendly scanner.
While compromises exist, such as the absence of manufacturer-specific codes and a slightly hefty feel, the CR529 still delivers essential functionalities like live data, instant inspection reports, and detailed insights into your car’s systems. Lifetime updates ensure its long-term usability without recurring subscription fees.
For most car owners seeking a reliable and affordable OBD2 scanner, the Launch CR529 is an excellent choice.
Read our full Launch CR529 review
Best Pro-Level OBD2 Scanner
[
(Image credit: Future)
3. Topdon Phoenix Lite 2
Professional Diagnostics for Enthusiasts and Mechanics
Our Expert Review:
Specifications:
- Display/Size: Color/8-inch
- Bluetooth/Handheld: Yes/Yes
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Number of Keys: Touchscreen
- Warranty: 2 years
- Size: 10.2 x 7.2 x 1.7 inches
- Weight: 2.6 pounds
Reasons to Buy:
- Professional-grade OBD scanner features
- Versatile handheld with Wi-Fi and Bluetooth
- Large 8-inch touchscreen display
- Extensive diagnostic tests and live data
- Includes adapters and protective hard case
Reasons to Avoid:
- Bulky and heavy design
- Higher price point
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 bridges the gap between amateur and professional diagnostics, justifying its higher price with a wealth of advanced features. It provides capabilities typically found in professional workshop scanners, making it suitable for both serious DIYers and professional mechanics.
Its wireless design, featuring a Bluetooth-connected control pad, offers exceptional mobility around the vehicle. Despite its bulkier and heavier build, the Phoenix Lite 2 is ruggedly designed for workshop environments and includes a kickstand for convenience. It boasts advanced features like live data graphing and comprehensive fault information, far exceeding the capabilities of budget scanners.
Read our full Topdon Phoenix Lite 2 review
Best Dual-Purpose OBD2 Scanner
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
Scanner and Secondary Display in One
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 compact
- Functions as both a scanner and car display
- Offers handheld and Bluetooth scanning
Reasons to Avoid:
- Minimalist interface
- Small screen size
The Ancel BD310 distinguishes itself with its dual functionality. It operates as a standard handheld OBD2 scanner and, via Bluetooth connection to your smartphone, transforms into a secondary display showing crucial engine parameters within your car.
Its compact and lightweight design makes the BD310 exceptionally portable, easily storable in a glovebox. While the 2-inch screen is small and the four-key interface is somewhat basic, these aspects don’t hinder its diagnostic effectiveness. The 56-inch cable provides ample reach, and it performs essential functions like I/M readiness tests and displays performance data including coolant temperature, engine timing, and speed.
Read our full Ancel BD310 review.
Best OBD2 Scanner with Companion App
(Image credit: Carly)
5. Carly OBD-II Scanner
App-Enhanced Diagnostics for Select Car Brands
Our Expert Review:
Specifications:
- Display/Size: No
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: No
- Live Data Display: Yes
- Number of Keys: None
- Warranty: Lifetime
- Size: 2.9 x 1.5 x 0.7 inches
- Weight: 0.7 ounces
Reasons to Buy:
- User-friendly app interface
- Customization options available
- Live data visualization
- Maintenance and repair support
- Lifetime warranty and updates
Reasons to Avoid:
- Feature availability varies by car model
- App subscription can be costly
The Carly OBD Scanner stands out due to its exceptional companion app. Unlike many Bluetooth scanners with rudimentary apps, Carly offers a feature-rich and user-friendly mobile experience.
Beyond basic fault code reading and clearing, the Carly app provides repair assistance, used car check tools, and extensive customization options. A lifetime warranty adds further value. However, feature compatibility varies significantly across car models, with VW, BMW, and Ford vehicles benefiting the most. Access to advanced features requires an ongoing subscription, which can increase the overall cost.
Read our full Carly OBD scanner review
Other OBD2 Scanners We’ve Tested
-
Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a highly innovative Bluetooth OBD2 scanner, inheriting Innova’s renowned features like predictive diagnostics in a wireless format. Its incredibly simple setup and robust features make it a compelling Bluetooth-only option.
Read the full Innova CarScan Mobile 1000 review
-
ThinkCar ThinkDiag TKD01 (★★★★☆)
Despite its larger size for a Bluetooth OBD2 scanner, the ThinkCar ThinkDiag TKD01 is remarkably durable. It offers extensive manufacturer-specific error codes and advanced fault-code diagnostics that can resolve minor issues without needing a mechanic. A subscription is required after the first year.
Read our full ThinkCar ThinkDiag TKD01 review.
-
Autel AutoLink AL539 (★★★☆☆)
The Autel AutoLink AL539 excels in diagnosing electrical problems, thanks to its integrated multimeter. It can identify issues like burnt wires, shorts, and blown fuses. It also provides a broad range of live data and pre-inspection readiness checks.
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 car owners use to understand a vehicle’s health. Instead of manually inspecting every component, these scanners plug into your car’s OBD port to retrieve data from the onboard computer.
At their most basic, OBD2 scanners read and interpret Diagnostic Trouble Codes (DTCs) generated by your car when it detects a problem. More advanced scanners monitor vehicle systems in real-time and can even predict potential future issues.
What is the OBD2 Port?
The On-Board Diagnostics Version Two (OBD2) port has been a standard feature in most passenger vehicles sold in the US since 1996, Canada since 1998, the EU since 2004, and other regions including Australia, Mexico, and New Zealand by 2006.
This standardized port is the interface point to your car’s computer system. Beyond OBD2 scanners, it’s also used by insurance tracking devices, dash cams, and other vehicle data logging equipment.
If you’re unsure of your OBD2 port’s location, refer to resources on finding your car’s OBD2 port in North American vehicles or worldwide OBD2/EOBD port locations.
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, enabling users to diagnose vehicle problems. While many DTCs are standardized across car manufacturers, some are manufacturer-specific.
Understanding DTC Meanings
DTCs might seem cryptic at first glance, but they follow a logical structure to indicate the type and location of the problem.
The first character indicates the affected vehicle system:
- P – Powertrain (engine and transmission)
- B – Body (interior and body electronics)
- C – Chassis (braking, suspension, steering)
- N – Network (communication systems)
The second character is a digit indicating code type:
- 0 – Generic (SAE standard) code
- 1 – 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 Control & Idle Control
- 6 – Computer Output Circuit
- 7, 8, 9 – Transmission Faults
- A, B, C – Hybrid Propulsion System Faults
The fourth and fifth characters pinpoint the specific fault within the identified system, ranging from 00 to 99.
OBD2 scanners interpret these codes into understandable descriptions. Advanced models offer more detailed information. Online resources like Google can also help decipher DTCs, given the vast database of over 5,000 possible codes.
Not all DTCs signal critical issues. Some may indicate minor concerns like slightly elevated engine temperature.
Choosing the Best OBD2 Scanner for Your Needs
Using a Top Obd2 Scanner is the most effective way to gain insights into your car’s operation and diagnose potential problems. It’s the same technology used by dealerships and repair shops, putting diagnostic power directly in your hands.
OBD2 scanners come in two main types:
- Handheld OBD2 scanners: These units have an integrated screen and connect directly to your car’s OBD port via a cable.
- Wireless OBD2 scanners: These plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for data display.
High-quality OBD2 scanners are available across various price points, including budget-friendly options under $30 and feature-rich models under $200. Key factors to consider when choosing the best OBD2 scanner include:
- Ease of Setup: A user-friendly setup ensures you’ll use the scanner promptly when issues arise.
- Fault Code Explanation: Top scanners not only display fault codes but also provide clear explanations, aiding in DIY repairs or informed communication with mechanics.
- I/M Readiness Check: This feature verifies if your car will pass emissions inspections by checking critical engine and emissions systems.
- Accuracy: Reliable and accurate readings are crucial for effective diagnostics.
- Size and Ergonomics: A compact and easy-to-handle scanner is more likely to be kept in your car for on-the-go diagnostics.
- Live Data Monitoring: Access to real-time engine data helps diagnose intermittent problems and monitor performance.
- Data Visualization (Graphs): Graphical data representation enhances data interpretation, especially for comparative analysis.
- Warranty and Updates: Opt for scanners with robust warranties and software updates to ensure long-term usability and compatibility with newer vehicles.
When selecting an OBD2 scanner, decide between handheld and wireless based on your preference. Consider features like screen size for handheld units, aiming for a clear, icon-based display. For ruggedness, choose models with protective bumpers.
Explore extra features such as built-in multimeters, manufacturer-specific code reading, and PDF report generation. Remarkably, professional-grade features are now accessible in scanners priced under $100, representing a significant value compared to mechanic labor costs.
Our OBD2 Scanner Testing Methodology
At TechCarUSA, we rigorously test OBD2 scanners to ensure our recommendations are reliable and practical. Our testing process involves using a 2014 Audi A4 Allroad over several weeks, both in a garage setting and during road tests.
We begin by verifying each scanner’s ability to correctly identify the vehicle identification number (VIN) when connected to the OBD2 port. For wireless scanners, we assess connectivity with devices like Apple iPads, Microsoft Surfaces, and Samsung Galaxy smartphones via Bluetooth or Wi-Fi. Handheld scanners are evaluated for cable length and ease of handling.
During vehicle operation, we monitor engine performance and vital systems using each scanner. To simulate diagnostic scenarios, we disconnect the engine oil temperature sensor and observe the scanner’s ability to detect and report the fault accurately. We then assess the clarity and detail of the fault code descriptions provided by each scanner. After resolving the simulated issue, we evaluate the scanner’s ability to clear the check engine light and erase the error code.
Road testing involves monitoring live engine data such as speed, timing, and coolant temperature, noting whether data is presented numerically, graphically, or via simulated gauges. We prioritize scanners that offer intuitive data presentation and comprehensive diagnostic information.
Our comprehensive testing ensures that our top OBD2 scanner recommendations are based on real-world performance and address the needs of both casual users and experienced automotive enthusiasts.
More From TechCarUSA
Explore more car diagnostic tools and reviews from TechCarUSA
