The 10 Best OBD2 Scanners

Updated June 19, 2017 by Brett Dvoretz

10 Best OBD2 Scanners
Best High-End
Best Mid-Range
Best Inexpensive
We spent 41 hours on research, videography, and editing, to review the top choices for this wiki. Back in the day, a good mechanic could tell you what was wrong with your car by simply listening to the engine. Not any more. Today's vehicles contain sophisticated software that requires on-board diagnostics to figure out. At least with one of these OBD2 scanners you'll know what's wrong before taking it to the shop or having a shot at fixing it yourself. When users buy our independently chosen editorial picks, we may earn commissions to support our work. Skip to the best obd2 scanner on Amazon.

10. BAFX Products 34t5

The BAFX Products 34t5 works on all US-based vehicles 1996 or later. It is a cost-effective choice with its super low price point, yet it is still dependable and accurate, and has no problem clearing diagnostic trouble codes.
  • works with most android obd apps
  • transmits real-time rpm data
  • bluetooth connection is inconsistent
Brand BAFX Products
Model 34t5
Weight 3.2 ounces
Rating 3.6 / 5.0

9. ScanTool 425801

The ScanTool 425801 has a USB attachment to plug directly into your computer, so you don't have to worry about any pesky handheld unit to break. Those who don't have a laptop, however, cannot use this model. It can be wrapped up and stored in the glove box, too.
  • free license key for obdwiz software
  • access graphs logs and export data
  • free lifetime software updates
Brand ScanTool
Model 425801
Weight 3.2 ounces
Rating 3.7 / 5.0

8. Buke OBD MATE

The Buke OBD MATE has a compact housing that fits comfortably in the palm of the hand and can easily be wiped clean of grease, so it's good for busy mechanics. It's also simple enough for home use by would-be mechanics ready to tackle their own problems.
  • detects obd-ii freeze frame info
  • accurately reads live data
  • does not work for airbags or brakes
Brand Blusmart
Model BUE0027AF
Weight 11.2 ounces
Rating 3.9 / 5.0

7. INNOVA 3100i

Easily check your O2 sensor, ABS systems, or shut off the check engine light with the INNOVA 3100i. It automatically refreshes data every 30 seconds, so you can quickly verify repair completion when you've finished fixing the problem.
  • battery backed-up memory
  • consumer-friendly diagnostic codes
  • includes a one-year warranty
Brand Innova
Model 3100i
Weight 1.5 pounds
Rating 4.1 / 5.0

6. MAOZUA V2016

Save an expensive trip to the mechanic and use the MAOZUA V2016 to check and clear your vehicle's trouble code. This model has CAN Protocol support, so it is compatible with a wider range of vehicles. It reads and clears all generic codes, but only some manufacturer codes.
  • accurate code reading
  • doesn't require any batteries
  • can save 15 scans for later viewing
Brand MAOZUA
Model VS550
Weight 1.2 pounds
Rating 4.3 / 5.0

5. ScanTool 427201

The ScanTool 427201 lets you turn any Android or Windows-based phone or tablet into an automotive diagnostic tool, and features hacker-proof technology. It is safe to leave plugged in without draining the battery, so you don't need to lift the hood to check diagnostics.
  • free firmware updates
  • can be installed in just 3 minutes
  • supports eobd and jobd too
Brand ScanTool
Model 427201
Weight 5.6 ounces
Rating 4.5 / 5.0

4. Lemur Vehicle Monitors BlueDriver

The Lemur Vehicle Monitors BlueDriver can read or clear trouble codes when the check engine light comes on, so you can avoid wasting money at the mechanic's shop. It also conveniently sends all of the data to your iOS or Android device.
  • can perform a smog check
  • can be left plugged in at all times
  • displays fuel trim data
Brand Lemur Vehicle Monitors
Model LSB2
Weight 2.4 ounces
Rating 3.9 / 5.0

3. Actron CP9680

The Actron CP9680 has CodeConnect software to quickly pinpoint the problem and the solution, so you can get right to work fixing the issue. Its large LCD screen has bright backlighting, which makes it easy to read even in sunlight.
  • trilingual support
  • expanded asian and abs code coverage
  • records and graphs live engine data
Brand Actron
Model CP9680
Weight 1.2 pounds
Rating 4.7 / 5.0

2. Autel AL519

The Autel AL519 provides state emissions readiness checks and drive cycle verification at the press of a button. It can read and record live O2 sensor data, display freeze frame data and VIN information on its large TFT color display.
  • provides audible diagnostics cues
  • can save a data report for printing
  • comes with a storage case
Brand Autel
Model AL519
Weight 2.1 pounds
Rating 4.8 / 5.0

1. Innova 3150f

The Innova 3150f is easy enough for home DIYers to use, but powerful and durable enough for professional use. It provides step-by-step instructions for resetting most codes in 1996 or newer vehicles, and it also features a battery and alternator tester.
  • easy-to-use hotkeys
  • live customer support line
  • can upload data to laptops
Brand Innova
Model 3150e
Weight 1.6 pounds
Rating 4.5 / 5.0

A Brief History Of OBD

On-board diagnostics (OBD) is a system that relies on sensors and computers in your car to display vital information about how your car is operating. In its earliest days, OBD took the form of cooling system gauges, tachometers, oil pressure gauges, and fuel level indicators to give us basic information about a car's condition. Nowadays, OBD systems can tell you about everything from crankshaft and camshaft position to manifold pressure to ignition misfires.

Computerized OBD systems started coming online with Volkswagen's fuel injected models as early as 1969. These early versions were very basic and would illuminate a malfunction indicator if there was a problem, but they didn't provide any useful diagnostic information about the actual nature of the problem. Later on in the early 1980s, General Motors began to implement a computerized assembly line diagnostic link (ALDL), which was actually capable of reading out error codes. New OBD2 systems and scanners use a digital communication port that relies a series diagnostic trouble codes, which identify the problem so it can be found and fixed quickly.

In 1991, the California Air Resources Board (CARB) instituted new regulations that required every new automobile to have an OBD1 system. These initial systems weren't standardized and each car manufacturer used its own connectors and data link protocol. In 1994, the Society of Automotive Engineers (SAE) recommended a standardized connector and data link protocol for all OBD systems and this became what is now known as OBD2. At the same time, CARB required that any car manufactured from 1996 and onward have the standardized OBD2 system installed and the U.S. government followed suit with nationwide regulations. The European Union instituted OBD2 regulations in October of 1998.

How To Use An OBD2 Scanner

Using an OBD2 scanner is actually quite simple and it doesn't require any mechanical knowledge. That's because OBD2 scanners don't fix problems, they identify them so that you, or a mechanic, can fix them without having to waste time trying to figure out what is wrong. OBD2 scanners are simply a diagnostic tool. Think of it like a doctor's visit for your car.

The first step in using an OBD2 scanner is to find your vehicle's diagnostic or data link connector (DLC). It is a somewhat triangular 16-pin connector that looks similar to old computer monitor and printer ports. It is most often located underneath the left hand side of the dashboard near the steering column. Once found, you insert the OBD2 scanner connector, this can either be a cable attached to the scanner or a separate device that wirelessly sends the information, so it can initiate communications with your on-board computers. You will then see some kind of message like "establishing data link" or "searching for protocol." If your screen does not light up with some kind of message, you device has not made a connection and you should try jiggling the connector or unplugging it and plugging it back in.

Next, you will have to enter your vehicle's information, which may include the make and model, VIN number, and engine type. Each scanner will require different information depending on the device model and manufacturer. After you scanner has made a connection, you've entered your vehicle information, and it has booted up, you can then start searching for trouble codes. Browse through the scanner's menu until you see something that says "trouble codes", or just "codes". You may or my not be presented with an option to choose from specific systems like the transmission, brakes, powertrain, etc. If you are, select the system you want to check and then you will be presented with a code. If you aren't presented with an option of systems to check, your scanner will just immediately present you with the trouble code.

Understanding OBD2 Codes

Using the OBD2 scanner is just the first step. Next, you need to learn how to read the code you are presented with. You will be shown either an active code or a pending code. An active code alerts you to a malfunction that is keeping your check engine light illuminated. A pending code means that the OBD2 scan has failed an emission control system operation once, and if it fails again, your check engine light will be illuminated. At this point the malfunction will become an active code.

All of the trouble codes displayed will start with one of four letters. "P" is for powertrain codes and covers the emissions system, ignition system, fuel system, transmission, and engine. "B" is for body and covers power seating, seat belts, airbags, and more. "C" is chassis related and will cover your axles, brakes, wheel pressure, suspension, etc. "U" is for network and other communication related issues.

The second digit lets you know if it is a OBD2 standardized generic code or if it is manufacturer specific. 0 means it is generic, and 1 means it is manufacturer specific. The rest of the digits will identify the exact problem you car is experiencing. Since there are literally thousands of fault codes, nobody will have them all memorized and your next step will be to consult a list of OBD2 codes to find out what is wrong with your car.



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Last updated on June 19, 2017 by Brett Dvoretz

A wandering writer who spends as much time on the road as behind the computer screen, Brett can either be found hacking furiously away at the keyboard or perhaps enjoying a whiskey and coke on some exotic beach, sometimes both simultaneously, usually with a four-legged companion by his side. He hopes to one day become a modern day renaissance man.


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