Unlocking the secrets hidden within your car’s onboard computer is easier than ever with the Best Universal Obd2 Scanners. These ingenious devices act as a bridge, granting you direct access to the wealth of information your car diligently collects about its own health and performance. Whether you’re facing a perplexing dashboard warning light or simply want to stay ahead of potential issues, an OBD-II scanner empowers you to diagnose problems like a seasoned mechanic, all without the hefty professional service fees.
Navigating the world of OBD-II scanners can feel daunting, especially for newcomers. The sheer variety of options and technical jargon can be overwhelming. We understand – we’ve been there too. That’s why we’ve rigorously tested a wide spectrum of OBD-II scanners over the years. Our hands-on experience allows us to confidently guide you towards the truly exceptional models available today. Keep reading to discover our top recommendations, and delve into our comprehensive guide explaining how OBD-II scanners function and decipher those cryptic error codes.
Among our top-rated scanners, the Topdon TopScan stands out with its seamless wireless operation and surprisingly robust diagnostic capabilities. For those mindful of budget, the Launch CR529, priced around $40, delivers exceptional value. If you demand a professional-grade diagnostic experience, and are prepared to invest accordingly, the Topdon Phoenix Lite 2 offers features comparable to those used by professional mechanics, albeit at a premium price of $799.
Below are our expertly curated selections for the best universal OBD-II scanners currently on the market.
Tom Pritchard
Tom is the UK Phones Editor for Tom’s Guide, a seasoned expert in mobile technology and automotive tech. He offers in-depth coverage of everything from cutting-edge smartphones to the latest advancements in electric vehicles.
The Best Universal OBD2 Scanners at a Glance
Here’s a quick overview of the best universal OBD-II scanners you can purchase right now, based on our rigorous, hands-on testing. Continue scrolling for detailed reviews of each scanner and insights into what makes them excel.
1. Topdon TopScan: Best Mobile Universal OBD2 Scanner
Based on our extensive testing, this Bluetooth scanner is exceptionally easy to set up and use. Despite its compact size, it packs professional-grade features, offering comprehensive diagnostics, repair guidance, parts lists, and even predictive analysis to anticipate potential problems.
Explore the Topdon TopScan in Detail
2. Launch CR529: Best Budget Universal OBD2 Scanner
The Launch CR529 is a compact yet powerful OBD-II scanner that delivers all the essential functionalities you expect, along with advanced features typically found in higher-priced models. Its lifetime support and updates make it an outstanding value for your money.
Discover More About the Launch CR529
3. Topdon Phoenix Lite 2: Best Rugged Universal OBD2 Scanner
Resembling a robust Nintendo Switch, the Topdon Phoenix Lite 2 boasts a durable, horizontal design built to withstand demanding environments. More than just rugged, it’s engineered for both professionals and DIY enthusiasts, providing powerful scanning capabilities in a resilient package.
Learn More About the Topdon Phoenix Lite 2
4. Ancel BD310: Best Dual-Purpose Universal OBD2 Scanner
The Ancel BD310 not only excels as an OBD-II scanner but also enhances your car’s dashboard by displaying a range of real-time engine specifications. It combines a sleek, user-friendly design with smartphone compatibility and an attractive price point.
Read More About the Ancel BD310
5. Carly OBD-II Scanner: Best Universal OBD2 Scanner with a Companion App
The Carly OBD-II Scanner’s utility is particularly pronounced for owners of VW, BMW, and Ford vehicles, unlocking a wealth of features. Its standout companion app is among the best we’ve tested, offering extensive customization and professional-level diagnostic tests.
Explore the Carly OBD-II Scanner Further
Discovering the Best Universal OBD-II Scanners: What to Look For
Why Trust Tom’s Guide? At Tom’s Guide, our commitment is to provide unbiased and thorough reviews to help you make the best purchasing decisions. Our team of expert writers and editors dedicates countless hours to analyzing, testing, and evaluating products, services, and apps. Learn more about our rigorous testing and rating methodologies.
Best Mobile Universal OBD-II Scanner
(Image credit: Topdon)
1. Topdon TopScan
The Ideal Tool for Deep-Dive Car Diagnostics
Read our expert review
Specifications:
| Feature | Specification |
|---|---|
| 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:
- Exceptional Automotive Diagnostic Coverage: Offers comprehensive diagnostic capabilities across a wide range of vehicle systems.
- Real-time Live Data: Provides access to crucial live data streams for in-depth performance analysis.
- Unique Performance Indicators: Includes features to assess vehicle performance and efficiency metrics.
- Extensive Maintenance Item Coverage: Supports diagnostics and maintenance procedures for various vehicle components.
Reasons to Avoid:
- Bulky and Heavy Transmitter: The Bluetooth transmitter module is larger and heavier than some competitors.
- Subscription Required for Advanced Features After One Year: Access to some advanced functionalities requires a subscription after the first year of ownership.
The Topdon TopScan might appear unassuming at first glance, but this compact scanner is a powerhouse of features. Far exceeding the capabilities of a basic Bluetooth OBD-II module that merely transmits data to a phone app, the TopScan impressed us with its advanced functionalities, rivaling scanners in higher price brackets.
Beyond basic fault code reading and 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 OBD-II scanners, even those costing significantly more. Whether you’re aiming to fine-tune your vehicle’s performance or ensure its roadworthiness, the TopScan is an invaluable addition to your toolkit.
Read our comprehensive Topdon TopScan review
Best Budget Universal OBD-II Scanner
(Image credit: Future)
2. Launch CR529
Unbeatable OBD-II Scanning Value Under $50
Read our expert review
Specifications:
| Feature | Specification |
|---|---|
| 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:
- Exceptionally Affordable: Priced under $50, offering remarkable value for budget-conscious users.
- Lifetime Updates: Ensures long-term functionality and compatibility with the latest vehicle models.
- Easy Pre-Inspection Report Generation: Simplifies vehicle inspection processes with readily generated reports.
Reasons to Avoid:
- Lacks Manufacturer-Specific Codes: Does not support proprietary diagnostic codes from specific car manufacturers.
- Feels Heavier in Hand: Slightly heavier than some comparable handheld scanners.
- Limited 1-Year Warranty: Offers a standard 1-year warranty, shorter than some competitors.
In our assessment, the Launch CR529 stands out as the best value universal OBD-II scanner currently available. Its affordability at around $38 is just the beginning; the range of diagnostic features it delivers at this price point is truly impressive. We were genuinely surprised by the capabilities packed into such a cost-effective device.
While compromises are expected at this price, such as the absence of manufacturer-specific code support and a somewhat hefty feel, the CR529 still provides essential features. These include live data streaming, an instant inspection function, and surprisingly detailed insights into your car’s internal systems. Furthermore, lifetime updates ensure the scanner remains a valuable tool for years to come, without any subscription fees.
While the CR529 might not fully satisfy users with professional automotive diagnostic needs, it’s an excellent choice for the average car owner seeking reliable and affordable diagnostic capabilities.
Read our full Launch CR529 review
Best Professional-Level Universal OBD-II Scanner
(Image credit: Future)
3. Topdon Phoenix Lite 2
Bridging the Gap Between DIY and Professional Car Diagnostics
Read our expert review
Specifications:
| Feature | Specification |
|---|---|
| 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 OBD Scanner: Delivers advanced diagnostic capabilities approaching professional-level equipment.
- Versatile Handheld with Wi-Fi and Bluetooth: Offers both handheld operation and wireless connectivity for enhanced flexibility.
- Large 8-inch Touchscreen Display: Features a spacious touchscreen for intuitive navigation and data visualization.
- Extensive Suite of Diagnostic Tests and Live Data: Provides a comprehensive array of diagnostic tests and real-time data monitoring.
- Includes Adapters and Rugged Hard Case: Comes with necessary adapters and a protective hard case for secure storage and transport.
Reasons to Avoid:
- Bulky, Heavy, and Sometimes Cumbersome: Its size and weight can make it less portable and slightly unwieldy.
- High Price Point: Represents a significant investment compared to entry-level OBD-II scanners.
- Subscription Required After Two Years: Firmware updates and continued access to certain features necessitate a subscription after the initial two-year period.
The Topdon Phoenix Lite 2 commands a higher price than many other capable OBD-II scanners, but it justifies the investment with a wealth of features. It’s ideally suited for both amateur car enthusiasts seeking advanced diagnostics and professional mechanics requiring a versatile and powerful tool.
A standout feature is its completely wireless operation. The control pad communicates with a Bluetooth receiver that plugs into the car’s OBD port, offering unparalleled freedom of movement around the vehicle. While the scanner itself is substantial in size and weight, it includes a kickstand and robust construction designed to withstand demanding workshop environments.
The Phoenix Lite 2 boasts advanced capabilities like live data graphing, detailed fault information, and numerous other features that surpass the abilities of more basic scanners. However, it’s important to note that firmware updates are included for only two years, after which an annual subscription of $495 is required to maintain access.
Read our full Topdon Phoenix 2 Lite review
Best Dual-Purpose Universal OBD-II Scanner
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
A Versatile OBD-II Scanner That Doubles as a Car Display
Read our expert review
Specifications:
| Feature | Specification |
|---|---|
| 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: Highly portable and easy to store in a glovebox or toolkit.
- Dual Functionality: Scanner and Secondary Car Display: Operates as both a standard OBD-II scanner and a real-time vehicle data display.
- Handheld and Bluetooth Scanning Options: Offers versatile connectivity with both handheld and smartphone-based scanning.
Reasons to Avoid:
- Minimalist Interface: The user interface is very basic and may lack advanced features.
- Small Screen Size: The 2-inch display can feel cramped for viewing detailed data.
The Ancel BD310 distinguishes itself as a dual-purpose scanner, functioning as a conventional handheld device and also connecting to smartphones via Bluetooth for enhanced capabilities. Notably, it can transform into a secondary display within your car, showing essential engine parameters in real-time.
We found the BD310 to be exceptionally convenient to keep on hand due to its compact and lightweight form factor, easily fitting into a glove compartment. While the 2-inch screen is somewhat small and the four-key interface felt a bit awkward initially, these minor drawbacks didn’t hinder its core diagnostic functions.
The 56-inch cable provides ample reach when working under the hood, and the BD310 efficiently performs key diagnostic tasks like I/M inspection-readiness tests and displaying performance data, including coolant temperature, engine timing, and engine speed.
Read our full Ancel BD310 review.
Best Universal OBD-II Scanner with Companion App
(Image credit: Carly)
5. Carly OBD-II Scanner
A Capable Scanner, Optimized by Your Car’s Compatibility
Read our expert review
Specifications:
| Feature | Specification |
|---|---|
| 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: Offers an intuitive and easy-to-navigate app interface.
- Extensive Customization Options: Provides a range of customizable settings and features within the companion app.
- Real-time Live Data Display: Delivers live data streams for comprehensive vehicle monitoring.
- Maintenance and Repair Guidance: Includes features to assist with vehicle maintenance and repair procedures.
- Lifetime Warranty and Updates: Backed by a lifetime warranty and ongoing software updates for long-term value.
Reasons to Avoid:
- Feature Availability Varies by Car Model: Not all features are compatible with every vehicle make and model.
- App Subscription Costs Can Accumulate: Access to advanced features beyond basic OBD functionality requires an ongoing subscription, which can become expensive.
The Carly OBD Scanner provides a compelling set of features, and we were particularly impressed by the quality of its companion app. While many Bluetooth scanners offer rudimentary app experiences, Carly’s app stands out as one of the best we’ve encountered.
Beyond basic light resetting and diagnostics, the Carly app offers repair assistance to guide you through fixing your car and tools to evaluate used vehicles for potential issues before purchase. The inclusion of a lifetime warranty is a significant advantage, providing long-term peace of mind.
However, the extent of features you can utilize depends on your car model. Compatibility varies, so verifying your vehicle’s compatibility before purchasing is essential. Additionally, while the app is excellent, accessing features beyond basic OBD functions requires an active subscription, which can add up over time if you’re not mindful of the costs.
Read our full Carly OBD scanner review
Additional OBD-II Scanners We’ve Evaluated
- Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a standout Bluetooth OBD-II scanner, incorporating Innova’s renowned features like predictive diagnostics in a wireless, phone-based format. Its incredibly simple setup process further enhances its appeal as a Bluetooth-only option.
Read the full Innova CarScan Mobile 1000 review
ThinkCar ThinkDiag TKD01 (★★★★☆)
Despite its larger size compared to typical Bluetooth OBD-II adapters, the ThinkDiag TKD01 boasts exceptional durability. It offers a wide range of manufacturer-specific error codes and advanced fault-code capabilities that can resolve minor issues without requiring a mechanic. However, a $40 subscription is necessary after the first year.
Read our full ThinkCar ThinkDiag TKD01 review.
Autel AutoLink AL539 (★★★☆☆)
The Autel AutoLink AL539 OBD-II scanner is specifically designed for diagnosing electrical problems, featuring a built-in multimeter. This allows it to identify issues like damaged cables, electrical shorts, and blown fuses. It also provides extensive live data and pre-inspection readiness check functionality.
Read our full Autel AutoLink AL539 review
Frequently Asked Questions about Universal OBD-II Scanners
What is an OBD-II Scanner?
Ever wondered how mechanics quickly pinpoint car problems? They don’t dismantle engines piece by piece. Instead, they use diagnostic scanners plugged into your car’s OBD port to access your onboard computer’s data.
OBD-II scanners, at their most basic, interpret error codes flagged by your car when it detects an issue. Advanced models go further, monitoring systems in real-time and even predicting potential future problems. Universal OBD2 scanners are designed to work across a wide range of vehicle makes and models, providing broad compatibility.
What is the OBD-II Port?
The On-Board Diagnostics Version Two (OBD-II) port is a standardized connector found in nearly all passenger vehicles sold in the United States since 1996, Canada since 1998, the European Union since 2004, and in Australia, Mexico, and New Zealand since 2006. This standardization ensures universal compatibility for diagnostic tools.
This port is the interface point for accessing your car’s onboard computer. Various devices can connect to the OBD-II port, including OBD-II scanners, insurance telematics devices, and modern dashcams.
If you’re unsure of your OBD-II port’s location, here’s a guide to finding your car’s OBD-II port in North American vehicles. For locations worldwide, refer to this guide on finding your OBD-II/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 detects a malfunction. These codes are read by OBD-II scanners, allowing users to understand the nature of the issue. Many DTCs are standardized across vehicle manufacturers, ensuring a degree of universality in diagnostics. However, some manufacturers also use proprietary DTCs specific to their vehicles.
What Do DTCs Actually Mean?
DTCs may seem like random alphanumeric strings at first glance. However, they follow a logical structure to indicate the type and location of the problem. Understanding this structure allows for a more informed diagnosis, even before consulting a scanner’s code definition.
The first letter designates the affected vehicle system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character, a number, indicates whether the code is generic (0) (standardized across manufacturers) or manufacturer-specific (1).
The third character further 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 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 provide the precise fault, ranging from 0 to 99.
OBD-II scanners translate these codes into understandable descriptions. Advanced scanners offer more detailed information. However, online resources like Google can also be helpful, as there are over 5,000 potential DTCs.
Not all DTCs indicate critical problems. While they signal significant issues, some codes may simply alert you to minor concerns like a slightly elevated engine temperature.
Choosing the Best Universal OBD-II Scanner for Your Specific Needs
If you seek insights into your car’s operation or the cause of that persistent check engine light, an OBD-II scanner is your best tool. It provides the same diagnostic information used by dealerships and repair shops. Why not have this capability yourself? It’s important to remember that not all OBD-II scanners are created equal. There are two primary types:
Handheld OBD-II scanners feature an integrated screen and connect to your car’s OBD port via a cable. Wireless OBD-II scanners plug into the OBD port and communicate wirelessly via Bluetooth to a smartphone or tablet for displaying results. Universal OBD2 scanners are available in both handheld and wireless formats, ensuring you can find a type that suits your preferences.
Regardless of the type, many high-performance OBD-II scanners are available for under $200, with some even priced below $30. Key considerations when choosing the best universal OBD-II scanner include size, weight, and the ability to accurately read fault codes and live data. The most crucial criteria are:
- Ease of Setup: A scanner that’s quick and easy to set up is more likely to be used for timely diagnostics.
- Fault Code Explanations: Top scanners not only display fault codes but also provide clear explanations, enabling DIY repairs or informed discussions with mechanics.
- I/M Readiness Check: A valuable feature for verifying emissions system readiness for state inspections.
- Accuracy: Accurate readings are paramount; unreliable data is worse than no data at all.
- Size and Weight: Portability is key for on-the-go diagnostics; bulky scanners may remain unused in a toolbox.
- Live Data: Access to real-time engine parameters helps pinpoint intermittent issues.
- Graphs: Visual data representation through graphs enhances data analysis, especially for comparative assessments.
- Warranty: Consider scanners with robust warranties, ideally lifetime warranties, reflecting long-term reliability.
Choosing between handheld and wireless scanners depends on personal preference. Handhelds offer self-contained operation, while wireless scanners leverage the processing power and display of smartphones. Universal OBD2 scanners are available in both formats.
Prioritize longevity by selecting scanners with lifetime warranties or software updates to ensure compatibility with evolving automotive technology.
For handheld scanners, prioritize screen size, clarity, and user-friendly icon-based interfaces. If durability is a concern, opt for ruggedized scanners with shock-absorbing bumpers.
Consider extra features like built-in multimeters, manufacturer-specific code reading, or PDF report exporting.
The affordability of sophisticated OBD-II scanners, often under $100, makes them a cost-effective alternative to even a single hour of professional mechanic labor.
Our Universal OBD-II Scanner Testing Methodology
To rigorously evaluate the best universal OBD2 scanners, we employed a 2014 Audi A4 Allroad over several weeks, both in a garage setting and on the road. Each scanner was connected to the car’s OBD-II port, and we verified its ability to correctly identify the Vehicle Identification Number (VIN).
For wireless scanners, we tested connectivity with an Apple iPad Pro, Microsoft Surface, and Samsung Galaxy S9+ via Bluetooth or Wi-Fi. Handheld scanners were tested by simply plugging them into the OBD-II port, which provides power.
We assessed cable length on handheld scanners and wireless range on wireless models. With the car running, we monitored engine and vital systems, then simulated a fault by disconnecting the engine oil temperature sensor.
Finally, we evaluated the scanner’s diagnostic details, rectified the simulated fault, cleared the check engine light, and erased the error code.
Road testing involved observing the scanner’s ability to display real-time operating data like engine speed, timing, and coolant temperature. We noted data presentation formats, such as numerical values, graphs, or gauge-style displays.
Regardless of the OBD-II scanner used, understanding fault codes is essential. All fault codes consist 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 (e.g., air temperature, throttle position). Manufacturer-specific codes (starting with 1) are unique to specific carmakers and often indicate specialized hardware or in-depth problem analysis (e.g., a Ford P1112 code for intermittent intake air temperature sensor readings).
For example, a P0098 code typically indicates an issue with the engine’s intake air temperature sensor.
More Resources from Tom’s Guide
Explore more automotive tech reviews and guides from Tom’s Guide.
