The best OBD2 scanners are essential tools that give you direct access to your car’s onboard computer, unlocking a wealth of information about its health and performance. If you’ve got a mysterious dashboard light or suspect engine trouble, an OBD2 scanner can act as your personal car whisperer, helping you pinpoint problems without immediately running to an expensive mechanic.
Navigating the world of OBD2 scanners can be daunting, especially for beginners. We understand that firsthand. That’s why we’ve rigorously tested a wide array of OBD2 scanners to bring you a curated list of the top performers worth your investment. Below, we’ll dive into our top recommendations and also provide a helpful guide on how OBD2 scanners operate and decipher those cryptic error codes.
Among our top picks, the Topdon TopScan stands out as a remarkably versatile and wireless option for in-depth diagnostics. For budget-conscious users, the Launch CR529, priced around $40, offers incredible value. And for those seeking a professional-grade experience, the Topdon Phoenix Lite 2 delivers advanced diagnostic capabilities, though it comes with a higher price tag of $799.
Here are our choices for the best OBD2 scanners available on the market today.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, with expertise in mobile technology and a passion for electric vehicles.
Top OBD2 Scanner Picks at a Glance
These are the best OBD2 scanners you can purchase right now, based on our thorough hands-on testing. Continue scrolling for detailed reviews of each scanner and insights into their standout features.
1. Topdon TopScan: Best Mobile OBD2 Scanner
The Topdon TopScan impressed us with its effortless Bluetooth setup and a suite of professional-grade features packed into a compact design. Expect comprehensive diagnostics, repair guidance, parts lists, and even predictive analysis to anticipate potential issues.
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2. Launch CR529: Best Cheap OBD2 Scanner
The Launch CR529 is a small yet mighty OBD2 scanner that delivers essential diagnostic functionalities and even some premium features not commonly found in its price range. Its lifetime support and updates provide exceptional long-term value.
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3. Topdon Phoenix Lite 2: Best Rugged, Pro-Level OBD2 Scanner
Resembling a robust handheld gaming console, the Topdon Phoenix Lite 2 is built for both professionals and serious DIYers. This scanner is not only durable but also packs powerful features for in-depth vehicle diagnostics.
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4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
The Ancel BD310 is a versatile OBD2 scanner that can also function as an auxiliary dashboard display, showing real-time engine data. It combines OBD2 scanning with smartphone connectivity and a user-friendly design at an attractive price.
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5. Carly OBD-II Scanner: Best OBD2 Scanner with Companion App
The Carly OBD-II Scanner’s value is heavily dependent on your car make, with brands like VW, BMW, and Ford benefiting the most from its advanced features. However, its standout feature is its exceptional companion app, offering extensive customization and professional-level testing capabilities.
Deep Dive: Best OBD2 Scanners of 2024
Why Trust Tom’s Guide? Our team of expert reviewers dedicates countless hours to evaluating and testing products to provide you with reliable recommendations. Learn more about our rigorous testing methodology.
1. Topdon TopScan: Best Mobile OBD2 Scanner
(Image credit: Topdon)
Unleash Your Car’s Hidden Potential
Expert Review:
Specifications:
- Display: None
- Connectivity: Bluetooth
- Handheld: No
- I/M Readiness Test: Yes
- Live Data Display: Yes
- Keys: None
- Warranty: 2 years
- Dimensions: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Extensive vehicle diagnostic coverage
- Real-time live data monitoring
- Unique performance indicators
- Broad maintenance coverage
Reasons to Avoid:
- Larger transmitter size
- Subscription required for some features after one year
Don’t let its unassuming appearance fool you; the Topdon TopScan is a powerhouse in a compact OBD2 scanner. This isn’t just a basic Bluetooth OBD2 adapter; it offers features that surpass many competitors in its class. Beyond reading fault codes and running I/M Readiness tests, the TopScan excels in performance and efficiency analysis. It can even estimate your car’s horsepower and torque, features rarely found in scanners at this price point.
For car enthusiasts looking to fine-tune their vehicle or simply ensure its roadworthiness, the Topdon TopScan is an invaluable tool to have in your garage.
Read our comprehensive Topdon TopScan review
2. Launch CR529: Best Budget OBD2 Scanner
(Image credit: Future)
Unbeatable Value for Money
Expert Review:
Specifications:
- Display: Color, 2.8-inches
- Connectivity: None
- 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 feature
Reasons to Avoid:
- Lacks manufacturer-specific codes
- Feels somewhat heavy
- 1-year warranty
The Launch CR529 redefines value in the OBD2 scanner market. Priced under $50, it delivers a surprising array of diagnostic capabilities that punch well above its weight. We were impressed by the level of features offered at such an accessible price.
While compromises are expected at this price point, such as the absence of manufacturer-specific codes and a slightly heavier build, the CR529 still provides essential features like live data, instant vehicle inspection reports, and remarkably detailed insights into your car’s systems. The inclusion of lifetime updates ensures this scanner remains a valuable tool for years to come, without any subscription fees.
While the CR529 might not satisfy professional mechanics, it’s an excellent choice for everyday car owners seeking a reliable and affordable OBD2 scanner for DIY diagnostics.
Read our in-depth Launch CR529 review
3. Topdon Phoenix Lite 2: Best Pro-Level OBD2 Scanner
(Image credit: Future)
Professional Diagnostics for Amateurs and Experts
Expert Review:
Specifications:
- Display: Color Touchscreen, 8-inch
- 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:
- Near-professional OBD2 scanning capabilities
- Versatile 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 and heavy design
- Higher price point
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 commands a higher price than many OBD2 scanners, but it justifies the investment with a wealth of features that bridge the gap between amateur and professional-level diagnostics. It’s equally suited for experienced mechanics and serious car enthusiasts.
A standout feature is its wireless operation, with a Bluetooth adapter connecting to the car’s OBD port and communicating with the handheld control pad. This wireless freedom allows for greater mobility around the vehicle during diagnostics. While the scanner itself is substantial in size and weight, it features a built-in kickstand and rugged construction designed to withstand workshop environments.
The Phoenix Lite 2 offers advanced functionalities like live data graphing, detailed fault code information, and many more features typically found in professional-grade scanners. Keep in mind that firmware updates are included for two years, after which an annual subscription of $495 is required.
Explore our full Topdon Phoenix 2 Lite review
4. Ancel BD310: Best Dual-Purpose OBD2 Scanner
(Image credit: Tom’s Guide)
OBD2 Scanning and Secondary Display in One
Expert Review:
Specifications:
- Display: Color, 2 inches
- 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 compact design
- Functions as both a scanner and a secondary car display
- Offers handheld and Bluetooth scanning
Reasons to Avoid:
- Minimalist interface
- Small screen size
The Ancel BD310 stands out as a dual-purpose OBD2 scanner, functioning as a standard handheld device and, when paired with a smartphone via Bluetooth, as a supplementary display for your car’s vital engine stats. It can project key data directly onto your dashboard.
Its compact and lightweight design makes the BD310 exceptionally portable and easy to store in your glove compartment. While the 2-inch screen is admittedly small and the four-button interface takes some getting used to, these minor drawbacks don’t hinder its diagnostic capabilities.
The generous 56-inch cable provides ample reach while working under the hood. The BD310 is capable of performing essential functions like I/M readiness tests and displaying critical performance data, including coolant temperature, engine timing, and RPM.
Explore our detailed Ancel BD310 review.
5. Carly OBD-II Scanner: Best OBD2 Scanner with Companion App
(Image credit: Carly)
Unlock Advanced Features with a Powerful App
Expert Review:
Specifications:
- Display: None (App-based)
- Connectivity: Bluetooth
- Handheld: No
- I/M Readiness Test: No
- Live Data Display: Yes
- Keys: None
- Warranty: Lifetime
- Dimensions: 2.9 x 1.5 x 0.7 inches
- Weight: 0.7 ounces
Reasons to Buy:
- User-friendly companion app interface
- Extensive customization options
- Real-time 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 for full functionality
The Carly OBD Scanner distinguishes itself with its exceptional companion app, offering a far more refined user experience than many Bluetooth OBD2 scanners. While some Bluetooth scanners offer rudimentary apps, Carly provides one of the most feature-rich and intuitive apps we’ve tested.
Beyond basic fault code reading and clearing, the Carly app offers repair guidance, used car checks to prevent buying a lemon, and a lifetime warranty for peace of mind. This scanner truly shines when paired with its app.
However, the breadth of features available is car-dependent. Certain functionalities are optimized for specific brands like VW, BMW, and Ford. It’s crucial to verify compatibility with your vehicle before purchasing. Additionally, while the basic OBD2 functions are free, accessing advanced features requires an ongoing subscription, which can add to the overall cost.
Read our complete Carly OBD scanner review
Other OBD2 Scanners We’ve Tested
- Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a standout Bluetooth OBD2 scanner, inheriting Innova’s impressive predictive diagnostic capabilities in a wireless format. Its incredibly simple setup process makes it an appealing 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 a wide range of manufacturer-specific error codes and advanced fault code features that can resolve minor issues without requiring a mechanic. A $40 subscription is required after the first year.
Read our full ThinkCar ThinkDiag TKD01 review.
- Autel AutoLink AL539 (★★★☆☆)
The Autel AutoLink AL539 OBD2 scanner is specifically designed for diagnosing electrical problems, featuring a built-in multimeter. It excels at identifying issues like burnt wires, electrical shorts, 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 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, they connect to your car’s OBD port to access data from the onboard computer.
At their core, OBD2 scanners read and interpret error codes generated by your car when it detects a problem. Advanced models can also monitor vehicle systems in real-time and even predict potential future issues.
What is the OBD2 Port?
The On-Board Diagnostics Version Two (OBD2) port is a standardized port found in virtually 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 interface to your car’s onboard computer. Besides OBD2 scanners, devices like insurance black boxes and dash cams can also connect to this port.
If you’re unsure of your OBD2 port’s location, here’s a guide to finding your car’s OBD2 port in North American vehicles. For locations worldwide, refer to this guide on finding your OBD2/EOBD port globally.
What is a DTC?
DTC stands for Diagnostic Trouble Code. It’s the error code generated by your car’s OBD system when it identifies a problem. OBD2 scanners read these codes to help users diagnose vehicle issues. While many DTCs are standardized across car makes and models, some manufacturers use unique DTCs specific to their vehicles.
Understanding DTC Meanings
DTCs may seem like random characters at first glance, but they follow a logical structure that can provide clues about the nature of the error.
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 pinpoints the specific subsystem:
- 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 specify the exact fault, ranging from 0 to 99.
OBD2 scanners can translate these error codes into understandable descriptions. Advanced scanners offer even more detailed information. While a quick Google search can be helpful, remember there are over 5,000 potential DTCs.
Not all DTCs signify critical problems. While they can indicate major issues, some codes may simply warn of minor anomalies like a slightly elevated engine temperature.
Choosing the Right OBD2 Scanner for Your Needs
If you want to understand your car’s inner workings or diagnose a check engine light, an OBD2 scanner is the perfect tool. It’s the same technology used by dealerships and repair shops, putting diagnostic power in your hands.
There are two main types of OBD2 scanners:
- Handheld OBD2 scanners: These come with their own display screen and connect to your car via a cable.
- Wireless OBD2 scanners: These plug into the OBD port and transmit data wirelessly via Bluetooth to a smartphone or tablet.
Regardless of the type, many excellent OBD2 scanners are available for under $200, and some are even under $30. Key considerations when choosing an OBD2 scanner include:
- Easy Setup: A scanner should be quick and easy to set up to encourage regular use for early problem detection.
- Fault Code Clarity: The best scanners not only display fault codes but also provide clear explanations to help you understand the issue and decide on DIY repair or professional assistance.
- I/M Readiness Check: A valuable feature for emissions testing, this function checks if your car will pass state inspections.
- Accuracy: Reliable and accurate results are paramount for effective diagnostics.
- Size and Portability: A compact and lightweight scanner is more likely to be kept in your car for on-the-go diagnostics.
- Live Data Monitoring: Access to real-time engine data (speed, timing, etc.) aids in diagnosing intermittent problems.
- Data Visualization (Graphs): Visual representations of data, like graphs, are easier to interpret than raw numbers, especially for trend analysis.
- Warranty: Consider scanners with longer warranties, ideally lifetime warranties, for long-term value.
When selecting an OBD2 scanner, decide between handheld or wireless based on your preference. Prioritize models with lifetime updates to ensure compatibility with newer vehicles. For handheld scanners, opt for a large, clear, icon-based display. If durability is a concern, choose rugged models with protective bumpers.
Look for extra features like built-in multimeters, manufacturer-specific code reading, or PDF report exporting. With prices comparable to an hour of mechanic labor, a quality OBD2 scanner is a cost-effective investment.
Our OBD2 Scanner Testing Methodology
To evaluate the best OBD2 scanners, we used a 2014 Audi A4 Allroad over several weeks in both garage and road testing scenarios. Each scanner was connected to the car’s OBD2 port, and we verified its ability to read the Vehicle Identification Number (VIN).
For wireless scanners, we tested connectivity with Apple iPads, Microsoft Surface tablets, and Samsung Galaxy S9+ phones via Bluetooth or Wi-Fi. Handheld scanners were tested simply by plugging them into the OBD2 port for power.
We assessed cable length for handheld scanners and wireless range for Bluetooth models. With the engine running, we monitored engine performance and vital systems. We then simulated a fault by disconnecting the engine’s oil temperature sensor.
Finally, we evaluated the scanner’s ability to identify and explain the fault code, clear the code after fixing the sensor, and display live operating data like engine speed, timing, and coolant temperature, noting whether data was presented numerically, graphically, or via gauges.
We also deciphered fault codes, noting the structure of four numbers and a letter prefix:
- Powertrain (P)
- Body (B)
- Chassis (C)
- Undefined (U)
Generic codes (starting with 0) applicable to all vehicles (e.g., air temperature sensor) and manufacturer-specific codes (starting with 1) indicating specialized hardware or in-depth analysis (e.g., Ford intake air temperature sensor fault) were also examined during testing.
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