Having trouble with your car and that pesky check engine light? You’re not alone. Modern cars are complex machines, but thankfully, understanding what’s going on under the hood is easier than ever with an OBD-II scanner. These devices connect to your car’s computer, giving you insights into its health and potential problems. But with so many options on the market, the question becomes: What Obd Ii Scanner Should I Buy?
Don’t worry, choosing the right OBD-II scanner doesn’t have to be confusing. We’ve tested a wide range of scanners to bring you the best recommendations for various needs and budgets. Whether you’re a seasoned DIY mechanic or a first-time car owner, this guide will help you find the perfect tool to diagnose car troubles and save money on repairs.
From basic code readers to professional-grade devices, here are our top picks for the best OBD-II scanners you can buy right now.
Top OBD-II Scanner Recommendations
Here’s a quick rundown of the best OBD-II scanners we recommend, based on hands-on testing. Keep scrolling for detailed reviews and to learn more about choosing the right scanner for you.
[](best mobile scanner)
1. Topdon TopScan: Best Mobile Scanner
Easy to use and feature-rich Bluetooth scanner for comprehensive diagnostics on your smartphone.
[](best cheap scanner)
2. Launch CR529: Best Budget Scanner
Affordable and powerful handheld scanner with essential features and lifetime updates.
[](best rugged scanner)
3. Topdon Phoenix Lite 2: Best Professional-Level Scanner
Rugged, tablet-based scanner offering advanced diagnostics for both enthusiasts and professionals.
[](best dual-purpose scanner)
4. Ancel BD310: Best Dual-Purpose Scanner
Versatile scanner that functions as both a handheld device and a smartphone-connected dashboard display.
[](best scanner with a companion app)
5. Carly OBD-II Scanner: Best Scanner with Companion App
Feature-rich scanner with an outstanding companion app, especially for VW, BMW, and Ford vehicles.
Detailed OBD-II Scanner Reviews: Find the Right One for You
To help you decide what OBD II scanner you should buy, we delve deeper into each of our top recommendations, outlining their key features, pros, and cons.
Best Mobile OBD-II Scanner
(Image credit: Topdon)
1. Topdon TopScan
Perfect for in-depth car diagnostics via your smartphone.
Our expert review:
Specifications:
- Display/size: None (uses smartphone screen)
- Bluetooth/handheld: Yes/No
- I/M Readiness test: Yes
- Displays live data: Yes
- Number of keys: None (app-controlled)
- Warranty: 2 year
- Size: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to buy:
- Excellent vehicle diagnostic coverage
- Provides live data monitoring
- Unique performance indicators
- Covers essential maintenance items
Reasons to avoid:
- Larger transmitter size
- Subscription required for some features after the first year
If you’re looking for a compact yet powerful Bluetooth OBD-II scanner, the Topdon TopScan is an excellent choice. Don’t let its unassuming appearance fool you; this device is packed with features that go beyond basic error code reading. It offers in-depth diagnostics, performance and efficiency checks, and even horsepower and torque estimations, rivaling scanners that cost significantly more.
The TopScan excels in its ability to provide comprehensive automotive diagnostics and live data directly to your smartphone via Bluetooth. It’s incredibly user-friendly, making it easy to set up and navigate. Beyond reading fault codes and running I/M readiness tests, it offers predictive features to anticipate potential problems, repair instructions, and parts lists. For anyone wanting to understand their car’s performance and ensure it stays in top shape, the Topdon TopScan is a valuable tool to have.
Read our full Topdon TopScan review
Best Budget OBD-II Scanner
(Image credit: Future)
2. Launch CR529
A high-value OBD-II scanner that delivers impressive features at an unbeatable price.
Our expert review:
Specifications:
- Display/size: Color/ 2.8-inches
- Bluetooth/handheld: No/Yes
- I/M Readiness test: Yes
- Displays live data: Yes
- Number of keys: 8
- Warranty: 1 year
- Size: 6.5 x 3.8 x 1.2 inches
- Weight: 11 ounces
Reasons to buy:
- Very inexpensive
- Lifetime free updates
- Easy pre-inspection report generation
Reasons to avoid:
- Lacks manufacturer-specific codes
- Feels somewhat heavy
- 1-year warranty
If you’re searching for what OBD II scanner should I buy without breaking the bank, the Launch CR529 is a standout option. Priced under $50, it offers an exceptional level of diagnostic capability for its cost. It’s surprising how many features are packed into this budget-friendly handheld scanner.
While it may not have all the bells and whistles of more expensive models, the CR529 covers all the essentials and even includes some higher-end features typically found on pricier rivals. You get live data, instant vehicle inspection reports, and a user-friendly interface. The lifetime free updates are a significant bonus, ensuring your scanner remains current and useful for years to come. Although it lacks manufacturer-specific codes and has a slightly heavier feel, the Launch CR529 provides incredible value for money, making it perfect for car owners who need a reliable and affordable diagnostic tool.
Read our full Launch CR529 review
Best Professional-Level OBD-II Scanner
(Image credit: Future)
3. Topdon Phoenix Lite 2
Bridging the gap between amateur and professional automotive diagnostics.
Our expert review:
Specifications:
- Display/size: Color/8-inch
- Bluetooth/handheld: Yes/Yes
- I/M Readiness test: Yes
- Displays live data: 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:
- Near professional-grade OBD scanner
- Hybrid handheld with Wi-Fi and Bluetooth
- Large 8-inch touchscreen display
- Extensive diagnostic tests and live data
- Includes adapters and a hard case
Reasons to avoid:
- Bulky, heavy, and can be cumbersome
- Expensive initial investment
- Subscription required after two years for updates
For those serious about car diagnostics and wondering what OBD II scanner should I buy for more advanced tasks, the Topdon Phoenix Lite 2 is a top-tier option. While it comes with a higher price tag, it offers a wealth of features that justify the investment, especially if you need professional-level capabilities.
The Phoenix Lite 2 is designed for both amateur enthusiasts and professional mechanics. Its standout feature is its wireless operation, with a Bluetooth receiver that plugs into the OBD port, allowing freedom of movement around the vehicle. The 8-inch touchscreen control pad is rugged and features a kickstand, making it suitable for workshop environments. It provides live data graphing, detailed fault information, and advanced diagnostic functions that surpass most basic scanners. The inclusion of adapters and a hard case further enhances its professional appeal. Keep in mind the subscription cost for updates after the first two years, but for comprehensive diagnostics and near-professional functionality, the Topdon Phoenix Lite 2 is hard to beat.
Read our full Topdon Phoenix Lite 2 review
Best Dual-Purpose OBD-II Scanner
(Ancel BD310 Image credit: Tom’s Guide)
4. Ancel BD310
A versatile OBD-II scanner that doubles as a helpful car dashboard display.
Our expert review:
Specifications:
- Display/size: Color/2 inches
- Bluetooth/handheld: Yes/Yes
- I/M Readiness test: Yes
- Displays live data: 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 design
- Functions as both a scanner and secondary car display
- Offers handheld and Bluetooth scanning
Reasons to avoid:
- Minimalist interface design
- Small screen size
If you’re undecided on what OBD II scanner should I buy and value versatility, the Ancel BD310 offers a unique dual-purpose functionality. It works as a standard handheld OBD-II scanner and can also connect to your smartphone via Bluetooth to act as a secondary display for your car’s engine data.
The BD310 is remarkably compact and lightweight, making it easy to store in your glovebox and have on hand whenever you need it. While its 2-inch display is small and the four-key interface is somewhat basic, it’s still effective for diagnosing car issues. Its ability to display key engine parameters like coolant temperature, engine speed, and timing on your smartphone adds a practical dimension, turning it into a useful in-cabin tool. The 56-inch cable provides ample reach for comfortable use while working under the hood. For its portability and dual functionality, the Ancel BD310 is a solid choice.
Read our full Ancel BD310 review.
Best Scanner with a Companion App
(Image credit: Carly)
5. Carly OBD-II Scanner
A feature-rich scanner whose value is amplified by its exceptional companion app.
Our expert review:
Specifications:
- Display/Size: No (uses smartphone screen)
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: No
- Displays live data: Yes
- Number of keys: None (app-controlled)
- Warranty: Lifetime
- Size: 2.9 x 1.5 x 0.7 inches
- Weight: 0.7 ounces
Reasons to buy:
- User-friendly app interface
- Offers customization options
- Displays live data effectively
- Covers maintenance and repair information
- Lifetime warranty and updates
Reasons to avoid:
- Feature availability varies by car model
- App subscription can be expensive
If you’re prioritizing a seamless app experience and wondering what OBD II scanner should I buy for app integration, the Carly OBD-II Scanner is a top contender. While many Bluetooth scanners have basic apps, Carly stands out with one of the most comprehensive and user-friendly companion apps available.
The Carly scanner and app combination provides a wide array of features, including diagnosing issues, clearing fault codes, offering repair guidance, and even checking used cars for potential problems. The app is particularly strong on customization and offers professional-level tests, especially for VW, BMW, and Ford vehicles. The lifetime warranty is a rare and valuable benefit. However, it’s important to check compatibility with your specific car model, as feature availability varies. Also, to unlock the full potential beyond basic OBD functions, you’ll need an ongoing subscription, which can add to the overall cost. For users who want a deeply integrated and feature-rich app experience, Carly is an excellent choice, provided it aligns with your vehicle and budget.
Read our full Carly OBD scanner review
Other OBD-II Scanners We’ve Tested
While the above are our top picks, we’ve tested several other OBD-II scanners that are also worth considering:
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Innova CarScan Mobile 1000 (★★★★☆): A highly innovative Bluetooth scanner with predictive diagnostics and easy setup. Read the full Innova CarScan Mobile 1000 review
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ThinkCar ThinkDiag TKD01 (★★★★☆): A robust Bluetooth scanner with extensive manufacturer-specific codes and fault-clearing capabilities. Read our full ThinkCar ThinkDiag TKD01 review.*
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Autel AutoLink AL539 (★★★☆☆): Specialized for electrical diagnostics with a built-in multimeter and comprehensive live data. Read our full Autel AutoLink AL539 review
Frequently Asked Questions About OBD-II Scanners
Still unsure what OBD II scanner should I buy? Let’s address some common questions to help you make an informed decision.
What is an OBD-II Scanner?
An OBD-II scanner is a diagnostic tool that connects to your car’s On-Board Diagnostics (OBD) system, specifically the OBD-II port. This port provides access to your car’s computer, allowing scanners to read and interpret data related to vehicle performance and potential issues. Mechanics use these scanners to diagnose problems efficiently, and now, car owners can use them too. Basic scanners read error codes, while advanced models offer real-time monitoring and predictive analysis.
What is the OBD-II Port?
The OBD-II port is a standardized connector found in almost all passenger vehicles sold in the United States since 1996, and in other regions like Canada, Europe, Australia, and Mexico in subsequent years. It’s the interface point for accessing your car’s onboard computer system. Besides OBD-II scanners, other devices like insurance black boxes and dash cams can also utilize this port.
If you’re unsure about the location of your OBD-II port, you can find guides on locating it for North American cars and worldwide vehicles.
What is a DTC?
DTC stands for Diagnostic Trouble Code. When your car’s OBD system detects a problem, it generates a DTC, which is essentially an error code. OBD-II scanners read these DTCs to help users understand what’s going wrong with their vehicle. While many DTCs are standardized across car manufacturers, some are manufacturer-specific.
What do DTCs Actually Mean?
DTCs might seem like random combinations of letters and numbers, but they follow a logical structure. The first letter indicates the affected system:
- P – Powertrain (engine, transmission)
- B – Body (interior, airbags, etc.)
- C – Chassis (brakes, suspension, steering)
- N – Network (communication systems)
The second character is a number: 0 for a generic code and 1 for a manufacturer-specific code. The third character specifies the subsystem involved (e.g., fuel and air metering, ignition system). The last two characters pinpoint the exact fault.
OBD-II scanners can often provide descriptions of these codes, and advanced scanners may offer more detailed information. Online resources and search engines like Google can also be helpful in deciphering DTCs. It’s important to remember that not all DTCs represent critical issues; some may indicate minor problems like a slightly elevated engine temperature.
Buyer’s Guide: How to Choose the Right OBD-II Scanner For You
Choosing what OBD II scanner you should buy depends on your needs and technical expertise. Here’s a guide to help you decide:
Handheld vs. Wireless Scanners:
- Handheld OBD-II scanners have their own display and connect directly to your car via a cable. They are self-contained and easy to use.
- Wireless OBD-II scanners connect to your smartphone or tablet via Bluetooth. They are often more compact and leverage the processing power and display of your mobile device.
Key Criteria to Consider:
- Ease of Setup: A scanner should be easy to set up and connect to your vehicle.
- Fault Code Explanation: The best scanners not only display fault codes but also provide clear explanations of what they mean.
- I/M Readiness Check: This feature checks if your car will pass emissions inspections.
- Accuracy: Reliable and accurate readings are crucial for effective diagnostics.
- Size and Weight: Consider portability, especially if you want to keep the scanner in your car.
- Live Data: The ability to monitor real-time engine data can be invaluable for diagnosing intermittent issues.
- Graphs: Visual data representation (graphs) can make it easier to analyze live data.
- Warranty and Updates: Look for scanners with good warranties and software update options to ensure longevity and compatibility with newer vehicles.
Additional Features to Look For:
- Manufacturer-Specific Codes: Some scanners can read manufacturer-specific codes for more in-depth diagnostics.
- Advanced Functions: Features like ABS/SRS diagnostics, oil reset, battery registration, and bidirectional control are valuable for more comprehensive maintenance.
- Companion App Features: For wireless scanners, a well-designed app is essential for ease of use and access to advanced features.
- Ruggedness: If you work in a workshop environment, a rugged scanner can withstand tougher conditions.
Price vs. Features:
OBD-II scanners range in price from under $30 to several hundred dollars. Basic code readers are inexpensive and suitable for simple tasks like reading and clearing codes. More advanced scanners offer a wider range of features and are priced accordingly. Consider your budget and the level of functionality you need when deciding what OBD II scanner should I buy. For many car owners, a mid-range scanner that balances features and price is often the best choice.
How We Test OBD-II Scanners
To determine the best OBD-II scanners, we put each device through a series of practical tests using a 2014 Audi A4 Allroad. Our testing process includes:
- Initial Connection: Verifying successful connection to the car’s OBD-II port and reading the Vehicle Identification Number (VIN).
- Wireless Connectivity (for wireless scanners): Testing Bluetooth or Wi-Fi connection stability and range with devices like iPads, Microsoft Surface tablets, and Samsung Galaxy smartphones.
- Handheld Scanner Cord Length (for handheld scanners): Measuring the length and flexibility of the OBD-II cable.
- Live Data Monitoring: Assessing the scanner’s ability to monitor real-time engine data and vital systems while the car is running.
- Fault Code Generation and Reading: Simulating a fault by disconnecting the engine’s oil temperature sensor and evaluating the scanner’s ability to accurately report the fault code and provide details.
- Fault Code Clearing: Testing the scanner’s ability to clear the fault code and turn off the check engine light after resolving the simulated issue.
- Road Testing: Evaluating the scanner’s performance in displaying operational data, such as engine speed, timing, and coolant temperature, during actual driving conditions, and assessing data presentation (numbers, graphs, gauges).
By following this rigorous testing process, we aim to provide reliable and informed recommendations to help you decide what OBD II scanner is best for your needs.
Decoding Fault Codes: Understanding DTCs
As mentioned earlier, understanding Diagnostic Trouble Codes (DTCs) is key to using an OBD-II scanner effectively. Remember that DTCs consist of a letter followed by four numbers. The letter indicates the system (P, B, C, or U), and the numbers provide specific details about the fault.
- Generic vs. Manufacturer-Specific Codes: Codes starting with “P0” are generic powertrain codes common to all vehicles, like “P0098” indicating an issue with the intake air temperature sensor. Codes starting with “P1” are manufacturer-specific, like Ford’s “P1112,” which also relates to the intake air temperature sensor but with a more specific interpretation.
When you encounter a DTC, your OBD-II scanner should provide a description. Use this information as a starting point for diagnosis and repair. Combined with live data and other scanner features, DTCs are invaluable for understanding your car’s health and addressing issues promptly.
With the right OBD-II scanner and a bit of knowledge, you can take control of your car’s diagnostics and maintenance, saving time and money while ensuring your vehicle stays in top condition.
