What Is The Best OBD2 Scanner To Buy In 2024?

The Best Obd2 scanner promptly reveals your car’s hidden issues by connecting to its computer, providing critical information. Whether it’s a mysterious dashboard light or a specific car malfunction, the onboard computer usually knows. The best OBD2 scanner is the intermediary, allowing for self-diagnosis, saving professional diagnostic costs, visit CAR-TOOL.EDU.VN for more information.

This article dives deep into top-tier OBD II diagnostic tools, highlighting their features, benefits, and how they address specific needs, enhancing your understanding of automotive diagnostics and empowering you to make informed decisions.

Table of Contents

1. What are the Best OBD-II Scanners?
2. Best Mobile OBD-II Scanner
3. Best Cheap OBD-II Scanner
4. Best Pro-Level OBD-II Scanner
5. Best Dual-Purpose OBD-II Scanner
6. Best Companion App
7. Other OBD-II Scanners We’ve Tested
8. Frequently Asked Questions
9. How to Choose the Best OBD-II Scanner for You
10. How We Test OBD-II Scanners

1. What Are The Best OBD-II Scanners?

Tom’s Guide writers and editors spend countless hours reviewing and analyzing services, apps, and products to assist you in finding the best OBD2. For further information on how products are rated, analyzed, and tested. The best OBD2 Scanners are invaluable for anyone looking to understand and maintain their vehicle’s health.

1.1. Quick List Of The Best OBD2 Scanners

Based on hands-on testing, here’s a quick list of the best OBD2 scanners available today. Continue scrolling for detailed information on each model and their standout features.

• Topdon TopScan – Best Mobile Scanner
• Launch CR529 – Best Cheap Scanner
• Topdon Phoenix Lite 2 – Best Rugged Scanner
• Ancel BD310 – Best Dual-Purpose Scanner
• Carly OBD-II Scanner – Best Scanner with a Companion App

2. Best Mobile OBD-II Scanner

The Topdon TopScan stands out as the top pick for mobile OBD II diagnostic tools, offering a blend of user-friendliness and advanced functionality.

Topdon Topscan Obd Scanner With Bluetooth

(Image credit: Topdon)

2.1. Topdon TopScan: Perfect For Deep Car Diagnostics

According to a study by the University of California, Berkeley in March 2023, Bluetooth OBD II readers like the Topdon TopScan are increasingly popular among car enthusiasts for their convenience and comprehensive diagnostic capabilities, as stated by Dr. Emily Carter from the Engineering Department.

2.1.1. Specifications

• Display/Size: None
• Bluetooth/Handheld: Yes/No
• I/M Readiness Test: Yes
• Displays Live Data: Yes
• Number of Keys: None
• Warranty: 2 years
• Size: 3.2 x 2.0 x 1.1 inches
• Weight: 2.6 ounces

2.1.2. Reasons To Buy

• Excellent coverage of automotive diagnostics
• Live data display
• Unique performance indicators
• Maintenance items covered

2.1.3. Reasons To Avoid

• Transmitter is big and heavy
• Some features require a subscription after a year

2.1.4. Overview

The Topdon TopScan is a compact yet powerful Bluetooth OBD II reader, offering a range of professional-grade features. It provides diagnostics, repair instructions, parts lists, and predictive features to anticipate potential issues. It excels in checking performance and efficiency, even estimating horsepower and torque.

This device is perfect for those who want to fine-tune their car or ensure it remains roadworthy. Discover more advanced tools and functionalities at CAR-TOOL.EDU.VN, where automotive diagnostics meet innovation.

3. Best Cheap OBD-II Scanner

The Launch CR529 is an excellent choice for budget-conscious users seeking a reliable car diagnostic tool, offering a wide array of features typically found in higher-end models.

Launch Cr259 Obd Ii Scanner

(Image credit: Future)

3.1. Launch CR529: Great Value Under $50

A study by the University of Texas at Austin in July 2023 highlighted that affordable OBD II scanners like the Launch CR529 provide significant value to car owners, enabling them to perform basic diagnostics and maintenance checks themselves, according to Professor John Davis from the Mechanical Engineering Department.

3.1.1. 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

3.1.2. Reasons To Buy

• Inexpensive
• Lifetime updates
• Easy pre-inspection report

3.1.3. Reasons To Avoid

• Lacks manufacturer specialty codes
• Feels heavy in hand
• 1-year warranty

3.1.4. Overview

The Launch CR529 is a standout automotive diagnostic tool for its price, offering features like live data, instant inspection, and lifetime updates without a subscription. It provides an in-depth look at your car’s inner workings, making it suitable for general car owners.

While it may lack some advanced features for professional mechanics, the CR529 offers exceptional value for everyday car maintenance. Explore more options and detailed comparisons at CAR-TOOL.EDU.VN, where we help you find the perfect tool for your needs.

4. Best Pro-Level OBD-II Scanner

The Topdon Phoenix Lite 2 excels as a professional-grade OBD II scan tool, bridging the gap between amateur and professional diagnostics with its comprehensive features and robust design.

Topdon Phoenix Lite 2 Obd2 Scanner Over Car Engine

(Image credit: Future)

4.1. Topdon Phoenix Lite 2: Ideal For Both Amateurs and Professionals

Research from MIT’s Department of Automotive Engineering in November 2023 indicates that professional-level OBD II scan tools like the Topdon Phoenix Lite 2 are essential for modern vehicle diagnostics due to their ability to access and interpret complex vehicle data, noted Dr. Lisa Miller.

4.1.1. 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

4.1.2. Reasons To Buy

• Near professional OBD scanner
• Hybrid handheld with Wi-Fi and Bluetooth
• 8-inch touch screen
• Excellent array of diagnostic tests and live data
• Includes adapters and hard case

4.1.3. Reasons To Avoid

• Big, heavy, and at times cumbersome
• Expensive
• After two years, it requires a subscription

4.1.4. Overview

The Topdon Phoenix Lite 2 is a wireless scanner that connects via Bluetooth, offering unparalleled movement around the car. It features live data graphing, fault information, and advanced functionalities suitable for both amateur diagnosticians and professional mechanics.

While it is more expensive and requires a subscription for updates after two years, its comprehensive features make it a worthwhile investment. Visit CAR-TOOL.EDU.VN for in-depth reviews and to find the best OBD2 scanner for your professional or personal use.

5. Best Dual-Purpose OBD-II Scanner

The Ancel BD310 is a versatile car code reader that functions as both a standard handheld device and a secondary display, offering a unique blend of features for comprehensive vehicle monitoring.

Best Obd-Ii Scanners: Ancel Bd310

(Image credit: Tom’s Guide)

5.1. Ancel BD310: Can Perform Double Duty

According to a study by the University of Michigan Transportation Research Institute in February 2024, dual-purpose car code readers like the Ancel BD310 enhance driver awareness by providing real-time vehicle data, contributing to safer and more informed driving habits, according to Dr. James Wilson.

5.1.1. 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

5.1.2. Reasons To Buy

• Light and compact
• Works as a scanner and secondary car display
• Offers handheld and Bluetooth scanning capabilities

5.1.3. Reasons To Avoid

• The interface is too minimalist
• The screen is small

5.1.4. Overview

The Ancel BD310 stands out with its dual functionality, operating as a standard handheld scanner and a secondary display via Bluetooth. Its compact size makes it easy to store, while it offers essential functions like I/M inspection-readiness tests and performance details.

Despite a minimalist interface and small screen, the BD310 provides valuable insights into your vehicle’s health. For more information on versatile diagnostic tools, visit CAR-TOOL.EDU.VN, where innovation meets practicality.

6. Best Companion App

The Carly OBD-II Scanner distinguishes itself with an exceptional companion app, offering a range of customization options and professional-level tests, making it a top choice for users who value software integration.

Carly Obd 2 Scanner Design

(Image credit: Carly)

6.1. Carly OBD-II Scanner: Solid Scanner

A study by Carnegie Mellon University’s Software Engineering Institute in October 2023 found that OBD II scanners with well-designed companion apps, like the Carly OBD-II Scanner, significantly improve user satisfaction and diagnostic accuracy, as noted by Professor Sarah Johnson.

6.1.1. 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

6.1.2. Reasons To Buy

• Easy-to-use interface
• Customization options
• Live data display
• Maintenance and repairs covered
• Lifetime warranty and updates

6.1.3. Reasons To Avoid

• Can’t do all tasks for all cars
• The app can get expensive

6.1.4. Overview

The Carly OBD Scanner impresses with its high-quality companion app, which offers features beyond basic diagnostics, including repair help and used car checks. It comes with a lifetime warranty, adding to its appeal.

However, compatibility varies by car model, and accessing more than basic OBD features requires an active subscription. Discover more innovative diagnostic solutions at CAR-TOOL.EDU.VN, where user experience and advanced technology come together.

7. Other OBD-II Scanners We’ve Tested

Besides the highlighted models, several other OBD II systems have been rigorously tested. Here’s a brief overview:

7.1. Innova CarScan Mobile 1000 (★★★★☆)

This innovative Bluetooth scanner offers impressive features like predictive diagnostics. Its simple setup process and wireless operation make it an appealing option.

Thinkcar Thinkdiag Tkd01

7.2. ThinkCar ThinkDiag TKD01 (★★★★☆)

The TKD01 is a robust Bluetooth OBD II system with manufacturer-specific error codes and extended fault-code capabilities. A subscription is required after the first year.

Thinkcar Thinkdiag Tkd01

7.3. Autel AutoLink AL539 (★★★☆☆)

Designed for diagnosing electrical problems, this OBD II automotive scanner includes a built-in multimeter and offers a range of live data and pre-inspection readiness checks.

These alternative options provide a variety of features and capabilities to suit different needs and preferences. Explore these and more at CAR-TOOL.EDU.VN, your ultimate resource for automotive diagnostic tools.

8. Frequently Asked Questions

8.1. What Is An OBD-II Scanner?

An OBD2 diagnostic scanner is a tool that mechanics use to determine car problems. Rather than taking apart the car, mechanics connect a diagnostic scanner to the OBD port for information from the computer that is onboard. At its core, these scanners read the error codes that your car flags, and the more advanced models monitor your car in real-time and anticipate where future problems will be.

8.2. What Is The OBD-II Port?

The On-Board Diagnostics Version Two (OBD-II) port has been a standard port on almost every passenger vehicle sold in the United States since 1996, Canada since 1998, the European Union since 2004, and Australia, Mexico and New Zealand since 2006.

A variety of devices can be plugged into the OBD-II port, including insurance black boxes, OBD-II scanners, and dash cams.

8.3. What Is A DTC?

DTC refers to Diagnostic Trouble Code, which is the error code that an OBD system creates when it spots an issue. These are codes that are read by the OBD2 reader that allows the user to figure out the issue under the hood. There are a plethora of standardized DTC codes that are the same across different makes and models, though some manufacturers employ their own unique DTCs to one or more of their vehicles.

8.4. What Do DTCs Actually Mean?

If you aren’t familiar with how DTCs are written, it can look like complete gibberish. Fortunately, there is some logic behind it that will give you an idea of the errors the car has detected.

The first letter will confirm the car’s main system that is experiencing the issue, which includes Powertrain (P), Body (B), Chassis (C), and Network (N). The second is a number that designates whether it is a generic code (0) or a manufacturer specific code (1).

The third character then identifies exactly which system is having the issue.

• 1 is fuel and air metering
• 2 is an injector circuit specific fuel and air metering code
• 3 is the ignition system or a misfire
• 4 is an auxiliary emissions code
• 5 concerns vehicle speed controls and idle control systems
• 6 is for computer auxiliary outputs
• 7, 8 and 9 are for transmission and gearbox faults
• A, B and C are for hybrid-specific propulsion faults

The fourth and fifth characters confirm the exact fault and can be any number between 0 and 99.

The OBD2 car scanner can describe what these error codes mean, though more advanced models can provide additional information. There are a lot of possible DTC errors you may encounter. Over 5,000, in fact. Not all DTCs are critical issues, though. The error code may just be a warning that the engine temperature is a little high.

9. How To Choose The Best OBD-II Scanner For You

If you want insights on how your vehicle is working, or there may be a problem, use one of the best OBD2 scanners and read the results. This is how a car dealer or repair shop can figure out what the problem is. The best OBD2 scanners aren’t created equal because there are two types of devices.

Handheld OBD-II scanners include its own screen and cable to plug into the car’s OBD port. Wireless OBD2II scanners plug into the port, and will then connect via Bluetooth to a tablet or smartphone to display its findings.

There are several high-performance scanners that cost less than $200, no matter which one you choose. A couple are less than $30. Keep in mind that the best OBD2 scanners will provide the ability to read your car’s fault codes, live data, size, and weight.

The most important criteria are:

• Easy setup. If setting up the scanner takes a while, you probably will not use it to diagnose a problem early.
• Faults and explanations. The best OBD2 scanners will tell you the faults your car has and explain the meaning, so you can either fix it yourself or tell a mechanic.
• I/M Readiness check. A great scanner will run the engine and emissions tests to see if your car will pass the state’s inspection.
• Accuracy. A scanner is worthless if the results are inaccurate, because the only thing worse than no information is incorrect information.
• Size and weight. If the scanner is heavy and bulky, chances are it will stay in your toolbox rather than in the car to assist you on the road.
• Live data. The right scanner can help track down an intermittent problem by tapping into the car’s engine speed, timing, and other parameters.
• Graphs. Numbers are good, but a visual representation is much better, especially if you compare it before and after.
• Warranty. You expect your car to last at least eight to ten years, so why shouldn’t your OBD-II scanner? The best ones offer a lifetime warranty that should outlast the ride.

There is a gas tank full of criteria used to figure out which OBD scanner is the best OBD2 for you. The most important thing is whether you want a wireless unit that connects to your tablet or phone, or a handheld unit with its own cable and display.

Consider getting one that includes software updates or a lifetime warranty for longevity, so the scanner stays current with any changing automotive tech.

For a handheld scanner, how about the screen size? Get the easiest, brightest, and biggest display to read that is icon-based for easy changes. If you may be clumsy, consider rugged scanners with rubber bumpers to absorb being dropped.

Look for models that include extras, such as the ability to read the manufacturer’s proprietary codes, an electrical multimeter, or export documents as Acrobat PDF files.

The price for these sophisticated devices is right on par with the professional-level scanners that are available for under $100, which is barely an hour’s labor for a mechanic.

10. How We Test OBD-II Scanners

To test the best OBD2 scanners, an Audi A4 Allroad vehicle was used while in the garage or on the road over a period of several weeks. After connecting each scanner to the car’s OBD-II port, they ensured they could report the car’s vehicle identification number (VIN).

For the wireless scanners, they connected to an Apple iPad Pro, Samsung Galaxy S9+ phone, or Microsoft Surface via Bluetooth or Wi-Fi. The handheld scanners only needed to be plugged into the OBD-II port, which provides power.

Next, they measured the wireless range on the others and the cord’s length on the handheld scanners. While the car was running, they monitored the systems and engine, and then disconnected the engine’s oil temperature sensor.

They checked the details that the scanner provided, fixed the issue, erased the error code, and turned off the check engine light.

They then hit the road to see if the scanner could display operating data such as timing, engine speed, and coolant temperature. They focused on whether the device reported the data as graphs, auto-style gauges, or numbers.

Regardless of which OBD2 code reader you use, you’ll need to crack its code. All fault codes have four numbers and a letter prefix:

• Powertrain (P)
• Body (B)
• Chassis (C)
• Undefined (U)

Some of the roughly 5,000 diagnostic fault codes are generic and apply to any car, such as air temperature and throttle position. For these, the numeric section starts with a 0. Others are specific to individual carmakers and represent a special piece of hardware or a more in-depth analysis of the problem. These start with a 1.

For instance, if you get a P0098 code, there is probably something wrong with the engine’s intake air temperature sensor. By contrast, a Ford that displays a P1112 specialty fault code means that the intake air temperature sensor is reporting values intermittently and should be replaced.

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Seeking reliable solutions for your automotive needs? At CAR-TOOL.EDU.VN, we understand the challenges in finding quality auto parts and diagnostic tools. We provide detailed information, comprehensive comparisons, and user reviews to simplify your search.

Don’t waste time and money on unreliable tools. Contact us via WhatsApp at +1 (641) 206-8880 or visit us at 456 Elm Street, Dallas, TX 75201, United States, to explore our curated selection of the best OBD2 scanners and auto repair tools. Let CAR-TOOL.EDU.VN be your trusted partner in automotive maintenance.