The inner workings of modern cars can feel like a mystery, especially when that dreaded check engine light illuminates your dashboard. Luckily, the Best Automotive Code Scanners are here to demystify those vehicular secrets. These ingenious devices connect to your car’s onboard computer, granting you access to a wealth of diagnostic information. Whether you’re facing a minor hiccup or a major malfunction, an automotive code scanner can be your first line of defense, empowering you to understand and address car problems without immediately rushing to a mechanic.
However, navigating the world of automotive code scanners can be overwhelming. Not all scanners are created equal, and the sheer variety of options can be daunting, especially for beginners. Having personally tested numerous OBD-II scanners over the years, we understand this challenge. That’s why we’ve compiled a list of the top automotive code scanners available today, highlighting the best choices for various needs and budgets. Below, we’ll also delve into how these scanners operate and decipher those cryptic error codes, ensuring you’re well-equipped to take control of your car’s health.
Among our top recommendations, the Topdon TopScan stands out as a remarkably versatile wireless option, ideal for comprehensive diagnostics. For budget-conscious users, the Launch CR529, priced around $40, offers exceptional value. If you’re seeking professional-grade capabilities, the Topdon Phoenix Lite 2 delivers a powerful diagnostic experience, albeit at a premium price of $799.
Here’s a quick rundown of the best automotive code scanners you can purchase right now.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, with expertise spanning from mobile technology to automotive gadgets. A passionate advocate for electric vehicles, he brings a wealth of knowledge to the realm of car tech.
Quick Picks: The Best Automotive Code Scanners
Based on rigorous hands-on testing, here are our top recommendations for the best automotive code scanners. Continue scrolling for detailed reviews of each product and insights into their standout features.
1. Topdon TopScan
This Bluetooth automotive code scanner distinguishes itself with an effortless setup process and a suite of professional-grade features packed into a compact design. Expect comprehensive diagnostics, repair guidance, parts listings, and even predictive analytics to anticipate potential issues.
Dive Deeper into Topdon TopScan
2. Launch CR529
The Launch CR529 is a compact yet potent automotive code scanner offering a robust set of features typically found in higher-priced models. Benefit from lifetime support and updates, making this scanner an exceptional value proposition.
Explore the Launch CR529 in Detail
3. Topdon Phoenix Lite 2
Resembling a rugged tablet, the Topdon Phoenix Lite 2 is engineered for both professional mechanics and discerning car enthusiasts. This powerful automotive code scanner is built to endure demanding environments while delivering advanced diagnostic capabilities.
Learn More About Topdon Phoenix Lite 2
4. Ancel BD310
The Ancel BD310 excels as both an automotive code scanner and a supplementary dashboard display, offering a versatile tool for car diagnostics and real-time monitoring. Its user-friendly design and smartphone compatibility enhance its appeal.
Read More About Ancel BD310
Best Scanner with Companion App
5. Carly OBD-II Scanner
The Carly OBD-II Scanner’s utility is highly dependent on your vehicle make, with optimal functionality for VW, BMW, and Ford vehicles. Its standout feature is its exceptional companion app, offering extensive customization and professional-level diagnostic tests.
Explore the Carly OBD-II Scanner App
What Makes These the Best Automotive Code Scanners?
Why Trust Tom’s Guide? At Tom’s Guide, our commitment is to provide unbiased and thorough reviews. Our team of experts dedicates countless hours to evaluating products, services, and apps to guide you towards the best choices for your needs. Learn more about our rigorous testing and review process.
Best Mobile Automotive Code Scanner
(Image credit: Topdon)
1. Topdon TopScan
Unlock Your Car’s Full Potential with Deep Diagnostics
Read 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:
- Extensive automotive diagnostic coverage
- Real-time live data monitoring
- Unique performance indicators
- Comprehensive maintenance item coverage
Reasons to Avoid:
- Bulky transmitter
- Subscription required for some features after the first year
Despite its unassuming appearance, the Topdon TopScan is a powerhouse of automotive diagnostics. This isn’t just another Bluetooth OBD-II module; it significantly surpasses the capabilities of its competitors. Beyond basic fault finding and I/M Readiness tests, the TopScan excels in performance and efficiency analysis, even estimating horsepower and torque.
Remarkably, it offers features comparable to automotive code scanners costing ten times more. Whether you’re aiming to optimize your car’s performance or ensure its roadworthiness, the Topdon TopScan is an invaluable tool for your garage.
Read our full Topdon TopScan review
Best Budget Automotive Code Scanner
(Image credit: Future)
2. Launch CR529
Unbeatable Value for Under $50
Read 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:
- Extremely affordable
- Lifetime free updates
- Easy pre-inspection report generation
Reasons to Avoid:
- Limited manufacturer-specific codes
- Slightly heavy build
- 1-year warranty
The Launch CR529 redefines value in automotive code scanners. Priced under $50, it delivers a surprising array of diagnostic features, exceeding expectations for its price point.
While compromises exist, such as the absence of manufacturer-specific codes and a somewhat hefty feel, the CR529 compensates with live data, instant inspection capabilities, and a remarkably detailed view into your car’s internal systems. Lifetime updates ensure long-term usability without subscription fees.
Although not tailored for professional mechanics, the CR529 is an excellent choice for everyday car owners seeking a reliable and affordable automotive code scanner.
Read our full Launch CR529 review
Best Professional-Level Automotive Code Scanner
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(Image credit: Future)
3. Topdon Phoenix Lite 2
Bridging the Gap Between Amateur and Professional Diagnostics
Read 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 capabilities
- Versatile handheld with Wi-Fi and Bluetooth
- Large 8-inch touchscreen display
- Extensive diagnostic tests and live data parameters
- Includes adapters and protective hard case
Reasons to Avoid:
- Large, heavy, and sometimes cumbersome
- High price point
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 commands a higher price than many automotive code scanners, but it justifies the investment with a wealth of features catering to both amateur and professional users.
Its wireless design, featuring a Bluetooth receiver connecting the control pad to the car’s OBD port, offers exceptional mobility around the vehicle. Despite its bulkier build, the scanner incorporates a kickstand and rugged construction suited for workshop environments.
Advanced features like live data graphing, detailed fault information, and comprehensive diagnostic functions surpass the capabilities of most budget scanners. Note that firmware updates are subscription-based after the initial 2-year period, incurring an annual fee of $495.
Read our full Topdon Phoenix Lite 2 review
Best Dual-Purpose Automotive Code Scanner
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
A Versatile Scanner Serving Double Duty
Read 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 design
- Functions as both a scanner and secondary car display
- Offers handheld and Bluetooth scanning options
Reasons to Avoid:
- Minimalist interface
- Small screen size
The Ancel BD310 distinguishes itself as a dual-function automotive code scanner, operating as a standard handheld device or connecting to smartphones via Bluetooth. Notably, it can transform into a secondary display, providing real-time engine data within the car cabin.
Its compact and lightweight design makes the BD310 highly portable, easily fitting in a glovebox. While the 2-inch display is small and the four-key interface may feel slightly cumbersome, these aspects don’t hinder its diagnostic capabilities.
The 56-inch cable provides ample reach, and the BD310 performs essential functions like I/M inspection readiness tests and displays performance metrics including coolant temperature, engine timing, and engine speed.
Read our full Ancel BD310 review.
Best Automotive Code Scanner with Companion App
(Image credit: Carly)
5. Carly OBD-II Scanner
App-Driven Diagnostics, Car Dependent Functionality
Read 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
- Extensive customization options
- Real-time live data display
- Covers maintenance and repair procedures
- Lifetime warranty and updates
Reasons to Avoid:
- Feature availability varies by car model
- App subscription can be costly
The Carly OBD Scanner excels with its companion app, offering a superior user experience compared to many Bluetooth scanners with basic app interfaces.
Beyond reading and clearing codes, the Carly app provides repair assistance, used car checks, and a lifetime warranty, a rare and valuable offering.
However, feature availability is car-dependent, requiring compatibility verification before purchase. While the app is feature-rich, accessing advanced functions beyond basic OBD requires an ongoing subscription, which can add to the overall cost.
Read our full Carly OBD scanner review
Other Automotive Code Scanners We’ve Tested
Innova CarScan Mobile 1000 review” data-widget-type=”deal” data-render-type=”editorial”>Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 stands out as an innovative Bluetooth automotive code scanner, incorporating impressive Innova features like predictive diagnostics. This wireless iteration maintains the brand’s strengths while offering seamless smartphone integration and a straightforward setup.
Read the full Innova CarScan Mobile 1000 review
ThinkCar ThinkDiag TKD01 (★★★★☆)
Despite being larger than typical Bluetooth automotive code scanners, the ThinkCar ThinkDiag TKD01 boasts exceptional durability. It offers a wide range of manufacturer-specific error codes and advanced fault-code analysis capable of resolving minor issues without mechanic intervention. A subscription fee of $40 applies after the first year.
Read our full ThinkCar ThinkDiag TKD01 review.
Autel AutoLink AL539 (★★★☆☆)
The Autel AutoLink AL539 automotive code scanner is specifically designed for diagnosing electrical problems, aided by an integrated multimeter. It effectively identifies issues like damaged wiring, short circuits, and blown fuses. It also provides extensive live data and pre-inspection readiness checks.
Read our full Autel AutoLink AL539 review
Frequently Asked Questions About Automotive Code Scanners
What is an Automotive Code Scanner?
Mechanics rely on automotive code scanners to diagnose car problems efficiently. Instead of manual disassembly, they connect these diagnostic tools to your car’s OBD port, accessing data from the onboard computer.
Basic automotive code scanners read and interpret error codes generated by your car when it detects an issue. Advanced models offer real-time system monitoring and may even predict potential future problems.
What is the OBD-II Port?
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 Australia, Mexico, and New Zealand since 2006.
This port serves as the connection point to your car’s onboard computer. Various devices utilize the OBD-II port, including automotive code scanners, insurance telematics devices, and modern dashcams.
If you’re unsure of your OBD-II port location, resources are available to find your car’s OBD-II port in North American vehicles. For worldwide locations, consult guides on how to find your OBD-II/EOBD port globally.
What is a DTC (Diagnostic Trouble Code)?
DTC stands for Diagnostic Trouble Code, representing an error code generated by a car’s OBD system when it identifies a malfunction. Automotive code scanners interpret these codes to help users understand the underlying issue. While many DTCs are standardized across vehicle makes and models, some manufacturers utilize proprietary DTCs specific to their vehicles.
Decoding DTCs: What Do They Mean?
DTCs may appear cryptic initially, consisting of letters and numbers. However, a logical structure provides insights into the nature of the detected errors.
The first letter indicates the affected vehicle system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character, a number, denotes whether the code is generic (0) or manufacturer-specific (1).
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
- 5: Vehicle speed controls and idle control systems
- 6: Computer auxiliary outputs
- 7, 8, 9: Transmission and gearbox faults
- A, B, C: Hybrid-specific propulsion faults
The fourth and fifth characters pinpoint the exact fault, ranging from 0 to 99.
Automotive code scanners translate these error codes into understandable descriptions. Advanced models offer more detailed information. Online resources like Google can assist in deciphering DTCs, of which there are over 5,000 possible codes.
Not all DTCs signify critical problems. While they can indicate major malfunctions, some codes may simply alert you to minor issues like slightly elevated engine temperature.
Choosing the Best Automotive Code Scanner for Your Needs
For deeper insights into your vehicle’s operation and potential problems, using one of the best automotive code scanners is invaluable.
These tools provide access to the same diagnostic information used by car dealerships and repair shops. Why not have this information at your fingertips? Automotive code scanners are broadly categorized into two types:
Handheld Automotive Code Scanners: These come with an integrated screen and a cable for direct connection to the car’s OBD port. Wireless Automotive Code Scanners: These plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for displaying diagnostic data.
Regardless of the type, numerous high-performance automotive code scanners are available for under $200, with some costing less than $30. Key considerations when choosing an automotive code scanner include:
- Ease of Setup: A quick and straightforward setup ensures you’ll readily use the scanner for early problem diagnosis.
- Faults and Explanations: The best scanners not only identify 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 function assesses major engine and emissions systems to predict inspection pass/fail status.
- Accuracy: Reliable results are paramount. Inaccurate scanner data is detrimental, making accuracy a critical factor.
- Size and Weight: Portability matters. A compact and lightweight scanner is more likely to be kept in your car for on-the-go diagnostics.
- Live Data: Real-time monitoring of engine speed, timing, and other parameters aids in diagnosing intermittent issues.
- Graphs: Visual data representation through graphs enhances data interpretation, especially for comparative analysis.
- Warranty: Consider scanner longevity. Opt for models with extended or lifetime warranties for long-term peace of mind.
Choosing the ideal automotive code scanner involves considering various factors. Decide between wireless (smartphone-connected) or handheld (integrated screen) types.
Prioritize longevity by seeking scanners with lifetime warranties or software update provisions to maintain compatibility with evolving automotive technology.
For handheld scanners, prioritize screen size, clarity, and icon-based interfaces for user-friendliness. Ruggedized scanners with protective bumpers are advisable for durability in demanding environments.
Explore additional features such as integrated multimeters, manufacturer-specific code reading, and PDF report export capabilities.
The affordability of sophisticated automotive code scanners, with professional-grade options under $100, makes them a cost-effective investment, often less than the cost of an hour of mechanic labor.
How We Test Automotive Code Scanners
To evaluate automotive code scanners, I utilized my 2014 Audi A4 Allroad over several weeks, testing in both garage and road conditions. Each scanner was connected to the car’s OBD-II port, verifying VIN reporting accuracy.
Wireless scanners were paired with an Apple iPad Pro, Microsoft Surface, or Samsung Galaxy S9+ via Bluetooth or Wi-Fi. Handheld scanners were tested via direct OBD-II port connection for power and functionality.
Cord lengths of handheld scanners and wireless ranges of Bluetooth models were measured. With the engine running, engine and vital systems were monitored. Subsequently, the engine oil temperature sensor was deliberately disconnected to induce an error.
Scanner detail provision and accuracy in identifying the induced fault were assessed. The issue was then rectified, the check engine light cleared, and the error code erased using the scanner.
Road tests followed, evaluating real-time data display of engine speed, timing, and coolant temperature. Data presentation formats (numerical, graphical, gauge-style) were noted.
Regardless of the automotive code scanner used, understanding fault codes is essential. All fault codes adhere to a format of four numbers and a letter prefix:
- Powertrain (P)
- Body (B)
- Chassis (C)
- Undefined (U)
Of the approximately 5,000 diagnostic fault codes, generic codes (starting with 0) apply universally across car brands, covering common issues like air temperature and throttle position. Manufacturer-specific codes (starting with 1) are unique to particular carmakers, indicating specialized hardware or in-depth problem analysis.
For example, a P0098 code typically indicates an intake air temperature sensor issue. Conversely, a Ford-specific P1112 code signifies intermittent intake air temperature sensor readings requiring sensor replacement.
