The Best Vehicle Scanners are essential tools that can unlock your car’s hidden data, connecting to its onboard computer and providing access to a wealth of information. Whether you’re facing a perplexing car issue or a dashboard warning light, your vehicle’s computer usually holds the answers. A vehicle scanner acts as an intermediary, enabling you to diagnose problems yourself, potentially saving you the cost of professional diagnostics.
However, not all vehicle scanners are created equal, and for those new to auto diagnostics, the choices can be overwhelming. We understand this, and that’s why we’ve rigorously tested a wide range of OBD-II scanners over the years. Our hands-on experience allows us to confidently recommend the scanners that truly deliver value. Continue reading to understand how vehicle scanners operate and what those cryptic error codes actually signify.
Among our top recommendations, the Topdon TopScan stands out as a completely wireless and surprisingly powerful tool for pinpointing car troubles. For budget-conscious users, the Launch CR529, priced around $40, is an excellent choice. If you’re seeking a professional-grade experience, the Topdon Phoenix Lite 2 delivers advanced diagnostics akin to what professionals use, though it comes with a higher price tag of $799.
Below are our top selections for the best vehicle scanners currently available.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, covering everything mobile tech, from the latest devices to essential apps. He’s also a passionate advocate for electric vehicles.
Top Picks for Best Vehicle Scanners
Here’s a quick overview of the best vehicle scanners you can purchase now, based on our thorough testing. Scroll down for detailed reviews of each scanner and insights into their standout features.
Topdon TopScan: best mobile vehicle scanner
1. Topdon TopScan
The Topdon TopScan is the easiest Bluetooth vehicle scanner to set up, according to our tests. Despite its compact size, it’s packed with professional-level features. This scanner offers comprehensive diagnostics, repair guidance, parts lists, and even predictive analysis to anticipate potential issues.
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Launch CR529: best cheap vehicle scanner
2. Launch CR529
The Launch CR529 is a small yet powerful vehicle scanner providing essential OBD-II functions and some advanced features typically found in more expensive models. Its lifetime support and updates make it an exceptional value for money.
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Topdon Phoenix Lite 2: best rugged vehicle scanner
3. Topdon Phoenix Lite 2
The Topdon Phoenix Lite 2, with its robust, horizontal design reminiscent of a Nintendo Switch, is built for both professionals and DIY enthusiasts. It’s a durable and powerful vehicle scanner designed to withstand demanding use.
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Ancel BD310: best dual-purpose vehicle scanner
4. Ancel BD310
The Ancel BD310 is a versatile vehicle scanner that functions as both an OBD-II scanner and an auxiliary dashboard display. It combines ease of use with smartphone compatibility at a reasonable price.
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Carly OBD-II Scanner: best vehicle scanner with a companion app
5. Carly OBD-II Scanner
The Carly OBD-II Scanner’s utility is highly dependent on your car’s make, with optimal performance for VW, BMW, and Ford vehicles. It boasts one of the most user-friendly companion apps, offering extensive customization and professional-grade testing features.
What are the Best Vehicle Scanners?
Why Trust Tom’s Guide
At Tom’s Guide, our team of writers and editors dedicates countless hours to evaluating and reviewing products, services, and apps to help you make the best choices. Learn more about our rigorous testing and rating process.
Best Mobile Vehicle Scanner
(Image credit: Topdon)
1. Topdon TopScan
Ideal for Deep Vehicle 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 vehicle diagnostic coverage
- Displays live data
- Unique performance indicators
- Covers maintenance items
Reasons to Avoid:
- Bulky transmitter
- Subscription required for some features after one year
The Topdon TopScan might appear unassuming, but this compact vehicle scanner is packed with features. It’s more than just a standard Bluetooth OBD-II module that transmits data to your phone app. We were impressed to find that it surpasses the capabilities of many competitors in its class.
Beyond basic fault detection and I/M Readiness tests, the TopScan excels in performance and efficiency analysis. It can even estimate your vehicle’s horsepower and torque, features rarely found in vehicle scanners at this price point.
Many OBD-II scanners costing significantly more lack these performance analysis capabilities. Whether you aim to fine-tune your car’s performance or ensure its roadworthiness, the TopScan is an invaluable addition to your toolkit.
Read our full Topdon TopScan review
Best Cheap Vehicle Scanner
(Image credit: Future)
2. Launch CR529
Top OBD-II Scanner 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:
- Affordable
- Lifetime updates
- Easy pre-inspection report generation
Reasons to Avoid:
- Lacks manufacturer-specific codes
- Feels heavy
- 1-year warranty
In our view, the Launch CR529 is arguably the best value vehicle scanner on the market. Its $38 price tag is remarkable, especially considering the diagnostic features it offers. We were surprised by the level of functionality available at such a low price.
There are, of course, compromises at this price point. The CR529 doesn’t support manufacturer-specific codes and feels somewhat heavy. However, it still provides live data, an instant inspection feature, and surprisingly detailed insights into your car’s systems. The lifetime updates are a significant bonus, ensuring long-term usability without subscription fees.
While the CR529 might not suit professional mechanics, it’s an excellent option for most car owners looking for a reliable and affordable vehicle scanner.
Read our full Launch CR529 review
Best Pro-Level Vehicle Scanner
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(Image credit: Future)
3. Topdon Phoenix Lite 2
Bridging the Gap Between Amateur and Professional Diagnostics
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:
- Near-professional grade vehicle scanner
- Hybrid handheld with Wi-Fi and Bluetooth
- 8-inch touchscreen
- Extensive diagnostic tests and live data
- Includes adapters and hard case
Reasons to Avoid:
- Large, heavy, and sometimes cumbersome
- Expensive
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 is a significant investment, costing more than many other capable vehicle scanners, but it offers exceptional value for the money. It’s ideally suited for both amateur and professional vehicle diagnostics.
A key feature of the Phoenix Lite 2 is its wireless operation. The control pad connects via Bluetooth to a receiver plugged into the car’s OBD port, allowing for complete freedom of movement around the vehicle. While the scanner itself is substantial, it includes a kickstand and a rugged design to withstand workshop environments.
It also offers live data graphing, detailed fault information, and advanced features typically absent in cheaper scanners. Note that firmware updates are included for two years, after which a $495 annual subscription is required.
Read our full Topdon Phoenix 2 Lite review
Best Dual-Purpose Vehicle Scanner
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
A Versatile Vehicle Scanner with Dual Functionality
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 a scanner and secondary car display
- Offers both handheld and Bluetooth scanning
Reasons to Avoid:
- Minimalist interface
- Small screen
The Ancel BD310 is a dual-purpose vehicle scanner that operates as a standard handheld device and connects to smartphones via Bluetooth. Uniquely, it can also function as a secondary display, showing essential engine data within the car.
Its compact and lightweight design makes the BD310 easy to store in a glovebox. The 2-inch display is small, and the four-key interface is somewhat basic, but it remains effective for vehicle diagnostics.
The 56-inch cable is ideal for use while working under the hood. The BD310 performs essential functions like I/M inspection-readiness tests and displays performance data, including coolant temperature, engine timing, and engine speed.
Read our full Ancel BD310 review.
Best Companion App Vehicle Scanner
(Image credit: Carly)
5. Carly OBD-II Scanner
Performance Depends on Your Car Model, App is Top-Notch
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 interface
- Customization options
- Live data display
- Maintenance and repair features
- Lifetime warranty and updates
Reasons to Avoid:
- Feature availability varies by car model
- App subscription can be costly
The Carly OBD Scanner offers a wealth of features, with its companion app being particularly impressive. Unlike basic apps accompanying other Bluetooth scanners, Carly provides one of the best app experiences we’ve encountered.
It not only diagnoses issues and clears warning lights but also offers repair assistance and used car checks. The lifetime warranty is a significant advantage.
However, the functionality of the Carly scanner varies depending on your car model. Compatibility should be verified before purchase. Also, while the app is excellent, advanced features require an ongoing subscription, which can add to the overall cost.
Read our full Carly OBD scanner review
Other Vehicle Scanners We’ve Tested
Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a highly innovative Bluetooth vehicle scanner, offering Innova’s renowned features like predictive diagnostics in a wireless format, operating via your smartphone. Its exceptionally easy setup process further enhances its appeal as a Bluetooth-only option.
Read the full Innova CarScan Mobile 1000 review
ThinkCar ThinkDiag TKD01 (★★★★☆)
The ThinkCar ThinkDiag TKD01, while larger than typical Bluetooth vehicle scanners, boasts a robust, almost indestructible build. It offers extensive manufacturer-specific error codes and advanced fault codes that can resolve minor issues without mechanic intervention. A subscription of $40 per year is required after the first year.
Read our full ThinkCar ThinkDiag TKD01 review.
Autel AutoLink AL539 (★★★☆☆)
The Autel AutoLink AL539 vehicle scanner is designed for diagnosing electrical problems, featuring a built-in multimeter to detect issues like burnt cables, shorts, 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 Vehicle Scanners
What is a Vehicle Scanner?
Vehicle scanners are the tools mechanics use to diagnose car problems. Instead of manually inspecting every component, they connect a diagnostic scanner to the car’s OBD port to access data from the onboard computer.
Basic vehicle scanners read and identify error codes generated by the car when it detects an issue. More advanced models monitor vehicle systems in real-time and can even predict potential future problems.
What is the OBD-II Port?
The On-Board Diagnostics Version Two (OBD-II) port is a standard port found in almost 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 port is the interface point for accessing the car’s onboard computer. It accommodates various devices, including vehicle scanners, insurance tracking devices, and dash cams.
If you’re unsure of your OBD-II port’s location, here’s how to find your car’s OBD-II port in North American vehicles. For worldwide locations, see find your OBD-II/EOBD port worldwide.)
What is a DTC?
DTC stands for Diagnostic Trouble Code, an error code generated by a car’s OBD system when it identifies a problem. These codes are read by vehicle scanners to help users understand vehicle issues. Many DTC codes are standardized across different vehicle makes and models, though some manufacturers use proprietary DTCs specific to their vehicles.
What Do DTCs Actually Mean?
DTCs may appear cryptic, consisting of numbers and letters. However, they follow a logical structure that indicates the type of error detected.
The first letter denotes the affected vehicle system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character, a number, specifies whether the code is generic (0) or manufacturer-specific (1).
The third character identifies the specific system area:
- 1: Fuel and air metering
- 2: Injector circuit fuel and air metering
- 3: Ignition system or misfire
- 4: Auxiliary emissions
- 5: Vehicle speed and idle control
- 6: Computer auxiliary outputs
- 7, 8, 9: Transmission and gearbox faults
- A, B, C: Hybrid propulsion faults
The fourth and fifth characters pinpoint the exact fault, ranging from 0 to 99.
Vehicle scanners interpret these error codes, with advanced models providing more detailed information. Further research on Google may be necessary, as there are over 5,000 potential DTC errors.
Not all DTCs indicate critical problems. While they can signal major issues, some codes may simply warn of minor conditions like slightly elevated engine temperature.
How to Choose the Best Vehicle Scanner for You
If you need insights into your vehicle’s operation or are troubleshooting a problem, a vehicle scanner is invaluable.
Vehicle scanners provide the same diagnostic capabilities used by dealerships and repair shops. Why not access this information yourself? Vehicle scanners come in two main types:
Handheld Vehicle Scanners include their own screen and connect to the car’s OBD port via a cable. Wireless Vehicle Scanners plug into the OBD port and connect to a smartphone or tablet via Bluetooth to display data.
Both types offer high-performance options under $200, with some under $30. Key considerations when choosing a vehicle scanner include:
- Easy Setup: Quick setup is crucial for timely diagnostics.
- Faults and Explanations: The best scanners explain fault codes, aiding DIY repairs or informing mechanics.
- I/M Readiness Check: Verifies emissions system readiness for state inspections.
- Accuracy: Reliable results are essential for effective diagnostics.
- Size and Weight: Compact and lightweight scanners are more convenient for in-car use.
- Live Data: Real-time monitoring of engine parameters helps identify intermittent issues.
- Graphs: Visual data representation enhances analysis, especially for comparisons.
- Warranty: A good warranty ensures long-term reliability; some offer lifetime warranties.
Choosing the right vehicle scanner depends on your needs. Decide between a Bluetooth scanner that uses your phone or tablet and a handheld unit with its own display.
Consider longevity and choose a scanner with lifetime updates or warranty to stay current with automotive technology.
For handheld scanners, prioritize screen size and clarity. Rugged models with rubber bumpers are beneficial for durability.
Look for extra features like electrical multimeters, manufacturer-specific code reading, or PDF export capabilities.
Sophisticated vehicle scanners are available at reasonable prices, often under $100, which is less than an hour of mechanic labor, making them a cost-effective investment.
How We Test Vehicle Scanners
To evaluate vehicle scanners, we used a 2014 Audi A4 Allroad over several weeks in various driving conditions. Each scanner was connected to the car’s OBD-II port, and we verified VIN reporting.
For wireless scanners, connections were tested with an Apple iPad Pro, Microsoft Surface, and Samsung Galaxy S9+ via Bluetooth or Wi-Fi. Handheld scanners were tested by direct OBD-II port connection.
Cord length (for handhelds) and wireless range were measured. With the car running, engine and system data were monitored. We then simulated a fault by disconnecting the engine oil temperature sensor.
Scanner details were checked, the simulated problem was resolved, and the check engine light and error code were cleared.
Road tests assessed live data display, including engine speed, timing, and coolant temperature, noting data presentation as numbers, graphs, or gauges.
Understanding fault codes is crucial. All codes consist of four numbers and a letter prefix:
- Powertrain (P)
- Body (B)
- Chassis (C)
- Undefined (U)
Of approximately 5,000 fault codes, generic codes (starting with 0) apply to all cars, like air temperature sensor issues. Manufacturer-specific codes (starting with 1) are unique to carmakers and represent specific hardware or detailed problem analysis.
For example, P0098 indicates an intake air temperature sensor issue. A Ford-specific P1112 code means the intake air temperature sensor is intermittently reporting values and likely needs replacement.
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