The best OBD2 scan tools are essential for modern car owners. These devices act like interpreters for your vehicle, connecting to its onboard computer to reveal the hidden language of error codes and performance data. Whether you’re facing a mysterious check engine light or simply want to understand your car better, a Top Obd2 Scan Tool empowers you to diagnose issues and make informed decisions about vehicle maintenance, potentially saving you money and time at the repair shop.
However, the world of OBD2 scanners can be overwhelming. With countless options available, ranging from basic code readers to advanced professional-grade tools, choosing the right one can feel daunting. That’s where our expert testing comes in. We’ve spent years evaluating a wide range of OBD2 scan tools, putting them through real-world tests to identify the top performers. We understand the nuances of each device and can guide you towards the best OBD2 scan tool for your specific needs and budget.
From user-friendly wireless adapters to comprehensive handheld scanners, our top picks cover a spectrum of features and price points. Keep reading to discover the best OBD2 scan tools available today, and learn how these invaluable devices work to unlock your car’s secrets. Further down, we’ll also delve into how OBD2 scanners function and demystify those perplexing error codes.
Among our top recommendations, the Topdon TopScan stands out as a remarkably versatile wireless option, offering a surprising depth of diagnostic capabilities. For budget-conscious users, the Launch CR529, priced around $40, delivers exceptional value. And for those seeking professional-level diagnostics, the Topdon Phoenix Lite 2 provides an experience akin to what professional mechanics use, albeit at a higher price of $799.
Here are our top selections for the best OBD2 scan tools you can purchase right now.
Tom Pritchard
Tom is the UK Phones Editor at Tom’s Guide, with expertise spanning from mobile tech to automotive gadgets. A passionate advocate for electric vehicles, he brings a wealth of knowledge to the realm of car technology.
The Quick List: Top OBD2 Scan Tools
Based on our rigorous hands-on testing, here’s a quick overview of the best OBD2 scan tools available. Scroll down to explore detailed reviews and discover why these scanners earned our top recommendations.
Best Mobile Scanner 1. Topdon TopScan
The Topdon TopScan is exceptionally user-friendly, boasting the easiest Bluetooth setup we’ve encountered. Despite its compact size, it packs a punch with professional-grade features, including in-depth diagnostics, repair guidance, parts information, and even predictive analysis to anticipate potential issues.
Read more below
Best Cheap Scanner 2. Launch CR529
The Launch CR529 is a small yet mighty OBD2 scan tool that delivers on essential diagnostic functions and includes surprising high-end features not typically found in its price range. Lifetime support and updates further enhance its value, making it an outstanding budget-friendly choice.
Read more below
Best Rugged Scanner 3. Topdon Phoenix Lite 2
Resembling a Nintendo Switch in its robust, horizontal design, the Topdon Phoenix Lite 2 is built for durability and professional use. More than just a tough device, it offers powerful diagnostic capabilities suitable for both professional mechanics and DIY enthusiasts seeking a high-performance OBD2 scan tool that can withstand demanding environments.
Read more below
Best Dual-Purpose Scanner 4. Ancel BD310
Beyond its primary function as an OBD2 scan tool, the Ancel BD310 can also serve as an auxiliary display for your car’s dashboard, providing real-time engine specifications. Its sleek design, smartphone compatibility, and affordable price further solidify its appeal as a versatile and practical tool.
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Best Scanner with Companion App 5. Carly OBD-II Scanner
The Carly OBD-II Scanner’s utility is highly dependent on your car’s make, with Volkswagen, BMW, and Ford vehicles benefiting most from its features. However, its standout feature is its exceptional companion app, considered one of the best in the market, offering extensive customization and professional-level diagnostic tests.
What are the Best OBD2 Scan Tools?
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Best Mobile OBD2 Scan Tool
(Image credit: Topdon)
1. Topdon TopScan
Perfect for Deep-Dive Car Diagnostics
Our Expert Review:
Specifications:
- Display/size: None
- Bluetooth/handheld: Yes/No
- I/M Readiness test: Yes
- Displays live data: Yes
- Number of keys: None
- Warranty: 2 year
- Size: 3.2 x 2.0 x 1.1 inches
- Weight: 2.6 ounces
Reasons to Buy:
- Excellent automotive diagnostic coverage
- Live data monitoring
- Unique performance indicators
- Comprehensive maintenance features
Reasons to Avoid:
- Bulky transmitter
- Subscription required for some features after one year
The Topdon TopScan may appear unassuming at first glance, but this compact OBD2 scan tool is packed with features that go far beyond basic code reading. This isn’t just a standard Bluetooth OBD-II adapter; it’s a sophisticated diagnostic tool that rivals scanners in a much higher price bracket. We were particularly impressed by its ability to perform in-depth diagnostics, run I/M Readiness tests, and even assess vehicle performance and efficiency. It can even estimate horsepower and torque, capabilities rarely seen in OBD2 scan tools at this price point.
For car enthusiasts looking to fine-tune their vehicle or simply ensure optimal roadworthiness, the Topdon TopScan is an invaluable addition to any toolbox.
Read our full Topdon TopScan review
Best Cheap OBD2 Scan Tool
(Image credit: Future)
2. Launch CR529
Unbeatable Value in an OBD2 Scan Tool for Under $50
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:
- Extremely affordable
- Lifetime updates included
- Easy pre-inspection report generation
Reasons to Avoid:
- Lacks manufacturer-specific codes
- Feels somewhat heavy
- Limited 1-year warranty
The Launch CR529 redefines value in OBD2 scan tools. Priced under $50, it offers a surprising array of diagnostic features that exceed expectations for its cost. We were particularly impressed by the level of functionality packed into such an affordable device.
While some compromises are expected at this price point, such as the absence of manufacturer-specific codes and a slightly heavier feel, the CR529 still delivers essential features like live data display, instant inspection reports, and a remarkably detailed view into your car’s internal systems. The inclusion of lifetime updates ensures long-term usability without recurring subscription fees.
Although the CR529 may not cater to professional mechanics seeking advanced features, it’s an excellent choice for everyday car owners seeking a reliable and budget-friendly OBD2 scan tool for home diagnostics.
Read our full Launch CR529 review
Best Professional-Level OBD2 Scan Tool
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(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:
- Professional-grade OBD2 scanner capabilities
- Versatile handheld with Wi-Fi and Bluetooth
- Large 8-inch touchscreen display
- Extensive diagnostic tests and live data
- Includes adapters and rugged carrying case
Reasons to Avoid:
- Large, heavy, and can be cumbersome
- High price point
- Subscription required after two years for updates
The Topdon Phoenix Lite 2 commands a premium price, exceeding that of many other capable OBD2 scan tools. However, it justifies its cost by delivering a wealth of features that cater to both amateur DIYers and professional mechanics. It effectively blurs the lines between consumer and professional diagnostic equipment.
A standout feature is its completely wireless operation. The control pad connects via Bluetooth to a receiver plugged into the OBD port, granting unparalleled freedom of movement around the vehicle. While the scanner itself is substantial in size and weight, it features a kickstand and robust construction designed to withstand the rigors of a workshop environment.
Beyond basic code reading, the Phoenix Lite 2 offers advanced capabilities including live data graphing, detailed fault information, and a suite of sophisticated diagnostic functions typically found in high-end professional scanners. Keep in mind that firmware updates are included for two years, after which a yearly subscription of $495 is required.
Read our full Topdon Phoenix 2 Lite review
Best Dual-Purpose OBD2 Scan Tool
Ancel BD310 (Image credit: Tom’s Guide)
4. Ancel BD310
A Versatile OBD2 Scan Tool that Doubles as a Car Performance 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 a 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-purpose OBD2 scan tool, functioning as both a traditional handheld scanner and, when connected to a smartphone via Bluetooth, as a supplementary display for crucial engine data within the car’s cabin.
Its compact and lightweight design makes the BD310 exceptionally portable, easily fitting in a glove compartment. While the 2-inch display is admittedly small, and the four-button interface felt slightly awkward during testing, these factors didn’t hinder its diagnostic capabilities.
The 56-inch cable provides ample reach for under-hood work, and the BD310 capably performs essential functions like I/M readiness checks and displays vital performance metrics such as coolant temperature, engine timing, and engine speed.
Read our full Ancel BD310 review.
Best OBD2 Scan Tool with a Companion App
(Image credit: Carly)
5. Carly OBD-II Scanner
A Capable Scanner, But Its Full Potential Depends on Your Car Make
Our Expert Review:
Specifications:
- Display/Size: No
- Bluetooth/Handheld: Yes/No
- I/M Readiness Test: No
- Displays live data: 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 compelling suite of features, with its companion app being a particular highlight. While many Bluetooth OBD2 scanners offer rudimentary apps, Carly stands out with one of the most polished and feature-rich apps we’ve tested.
Beyond basic diagnostics and fault code clearing, the Carly app provides repair assistance, pre-purchase used car inspections, and a lifetime warranty – a rare and valuable offering.
However, the Carly’s functionality is not universally applicable. Feature availability varies significantly depending on your car’s make and model. It’s crucial to verify compatibility with your specific vehicle before purchasing. Furthermore, accessing the full range of features beyond basic OBD functions requires an ongoing app subscription, which can become expensive over time.
Read our full Carly OBD scanner review
Other OBD2 Scanners We’ve Tested
Innova CarScan Mobile 1000 (★★★★☆)
The Innova CarScan Mobile 1000 is a standout Bluetooth OBD2 scan tool, inheriting Innova’s renowned features like predictive diagnostics in a wireless, phone-based format. Its exceptionally simple setup process further enhances its appeal as a convenient Bluetooth-only option.
Read the full Innova CarScan Mobile 1000 review
ThinkCar ThinkDiag TKD01 (★★★★☆)
While larger than typical Bluetooth OBD2 adapters, the ThinkCar ThinkDiag TKD01’s robust build makes it exceptionally durable. It offers a wide array of manufacturer-specific error codes and advanced fault code analysis, capable of resolving minor issues without professional intervention. 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 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 OBD2 Scan Tools
What is an OBD2 Scanner?
Mechanics utilize OBD2 scanners to diagnose car problems by accessing data from your car’s onboard computer via the OBD port. These scanners, in their most basic form, read and interpret error codes generated by your car when it detects an issue. More advanced OBD2 scan tools offer real-time system monitoring and can even predict potential future problems.
What is the OBD2 Port?
The On-Board Diagnostics Version Two (OBD2) port is a standardized port found in nearly 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 serves as the interface point for accessing your car’s onboard computer. Various devices can connect to the OBD2 port, including OBD2 scanners, insurance tracking devices, and dashcams.
If you need help locating your OBD2 port, here’s a guide to find your car’s OBD2 port for North American vehicles. For worldwide locations, refer to find your OBD2/EOBD port worldwide.
What is a DTC?
DTC stands for Diagnostic Trouble Code. These error codes are generated by a car’s OBD system when it detects a malfunction. OBD2 scanners read these DTCs, enabling users to identify the source of the problem. While many DTCs are standardized across vehicle makes and models, some manufacturers use proprietary DTCs specific to their vehicles.
What do DTCs Actually Mean?
DTCs may appear cryptic, consisting of seemingly random letters and numbers. However, they follow a logical structure that can provide insights into the nature of the detected error.
The first letter indicates the affected vehicle system: Powertrain (P), Body (B), Chassis (C), or Network (N). The second character, a number, designates whether the code is generic (0) or manufacturer-specific (1).
The third character pinpoints the specific subsystem experiencing the issue:
- 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 scan tools translate these error codes into understandable descriptions. Advanced models offer more detailed information. Online resources like Google can also be helpful, as there are over 5,000 potential DTCs.
Not all DTCs indicate critical problems. While they highlight issues, some codes may simply warn of minor deviations, such as a slightly elevated engine temperature.
How to Choose the Best OBD2 Scan Tool for You
If you want to understand your car’s health and diagnose issues, using a top OBD2 scan tool is the most effective approach. It’s the same method dealerships and repair shops use. Why not have access to the same diagnostic power?
OBD2 scan tools come in two main types:
- Handheld OBD2 scanners: These have their own display screen and connect directly to the OBD port via a cable.
- Wireless OBD2 scanners: These plug into the OBD port and connect wirelessly via Bluetooth to a smartphone or tablet for displaying data.
Regardless of the type, numerous high-performance OBD2 scan tools are available for under $200, and some even for under $30. Key factors to consider when choosing the best OBD2 scan tool include:
- Easy Setup: A quick and straightforward setup is crucial for convenient and timely diagnostics.
- Fault Codes and Explanations: The best OBD2 scan tools not only provide fault codes but also offer clear explanations, enabling you to understand the issue and decide on repair actions.
- I/M Readiness Check: A valuable feature for emissions testing, this check verifies if your car will pass state inspections.
- Accuracy: Reliable and accurate readings are paramount for effective diagnosis.
- Size and Weight: Portability is important for on-the-go diagnostics; a compact and lightweight scanner is ideal.
- Live Data: Real-time data monitoring of engine parameters aids in pinpointing intermittent problems.
- Graphs: Visual data representation through graphs enhances data analysis, especially for before-and-after comparisons.
- Warranty: A good warranty provides peace of mind and reflects product quality. Lifetime warranties are a significant advantage.
Choosing the right OBD2 scan tool involves considering your needs and preferences. Decide whether you prefer the convenience of a wireless scanner with your phone or tablet or a standalone handheld unit.
Longevity is another important aspect. Opt for scanners with lifetime software updates to ensure compatibility with evolving automotive technology.
For handheld scanners, prioritize screen size and clarity. A large, bright, icon-based display improves usability. If durability is a concern, consider ruggedized scanners with protective bumpers.
Explore extra features like built-in multimeters, manufacturer-specific code reading, and PDF report exporting, which can enhance functionality.
Remarkably, many sophisticated OBD2 scan tools are priced under $100, making them a cost-effective investment compared to even an hour of professional mechanic labor.
How We Test OBD2 Scan Tools
To evaluate OBD2 scanners, we conducted hands-on testing using a 2014 Audi A4 Allroad over several weeks, both in the garage and on the road. Each scanner was connected to the car’s OBD2 port, and we verified its ability to read the Vehicle Identification Number (VIN).
Wireless scanners were paired with an Apple iPad Pro, Microsoft Surface, or Samsung Galaxy S9+ via Bluetooth or Wi-Fi. Handheld scanners were powered directly through the OBD2 port connection.
We measured cable lengths for handheld scanners and wireless ranges for Bluetooth models. With the engine running, we monitored engine parameters and then simulated a fault by disconnecting the engine oil temperature sensor.
We assessed the detail of information provided by each scanner, rectified the simulated fault, cleared the check engine light, and erased the error code.
Finally, we road-tested each scanner, monitoring real-time operating data like engine speed, timing, and coolant temperature, noting data presentation in numerical, graphical, or gauge formats.
Understanding OBD2 fault codes is essential. All codes consist of five characters: a letter followed by four numbers. The letter indicates the system:
- Powertrain (P)
- Body (B)
- Chassis (C)
- Undefined (U)
Of the approximately 5,000 possible diagnostic fault codes, generic codes (starting with 0) apply to all vehicles and cover common issues like air temperature and throttle position. Manufacturer-specific codes (starting with 1) are unique to particular carmakers and may indicate specialized hardware or more detailed problem analysis.
For example, a P0098 code typically points to a problem with the engine’s intake air temperature sensor. In contrast, a Ford-specific P1112 code for the same sensor indicates intermittent readings and suggests sensor replacement.
