Getting Started with OBD-II Code Readers and Car Diagnostics

There are two tools that help you properly diagnose your vehicle’s OBD-II codes: code readers and scan tools. An OBD-II code reader can read, display, and even clear DTCs and reset the check engine light on your vehicle. It’s a convenient tool for car owners that want to perform these basic functions.

A scan tool, on the other hand, not only reads the codes but provides troubleshooting information and tips on properly diagnosing the issue. Scan tools can also read pending, generic, and manufacturer-specific codes. Some higher-end models can even record and playback live data and graph data and access specific parameter IDs.

Because code readers are simpler devices, they cannot be used on all cars because they don’t have as high of a computing capacity as scan tools do.

Choosing the right OBD-II scanner mostly comes down to the level of sophistication you need from the tool.

There’s a big difference between basic code readers and full-fledged scanners in that scanners can access enhanced OEM (Original Equipment Manufacturer) codes that are manufacturer-specific. These scanners don’t use the standard OBD-II protocol to communicate with the car’s modules. Instead, they use custom manufacturer-specific protocols through which they can connect to all the modules in the car, not just the emissions-related ones. They can also pull non-emissions related fault codes from the engine and transmission.

If you just want to read the OBD-II code that is being triggered, there are simple handheld scanners that will do the job. For more advanced professional use, you’ll need a software-based diagnostic tool that plugs into your vehicle and has higher communication capabilities.

The BlueDriver LS82 Bluetooth Pro OBD-II Scanner is a great scanner for home mechanics who want more information from their OBD scanner. The BlueDriver is more advanced than your standard OBD scanner in that it offers verified fixes for the OBD code provided. And since it works directly through your car’s Bluetooth connectivity, no cables are required. The BlueDriver contains a library of vehicle fixes and is verified by professional automotive technicians. This helps you make sure that you’re getting the right recommendation. The BlueDriver is available for around $130.

Once you’ve retrieved the OBD-II code from your scanner, you can use KBB.com ’s OBD-II code guide to find more information on that particular code. If you’re using a more advanced scanner, you’ll want to use the corresponding mobile app or software on your laptop that comes with the scanner.

If you’ve plugged in your OBD scanner and you’re not getting a reading, you’re more than likely having a connectivity or communication issue. This is typically caused by a blown fuse that’s s causing the lack of communication with the ECU. Check your fuses to make sure they haven’t gone bad before proceeding to further diagnostics. A clogged port can also be the cause of your OBD scanner not working or reading a code, so make sure to clear out any dust from your OBD port before trying again. Bottom line, if you’re re looking to properly diagnose your vehicle at home, you’ll need an OBD scanner to help you achieve the proper diagnosis. Getting the right scanner for your needs allows you to diagnose the problem with your car and get it serviced properly – and keep it running longer. New to OBD-II codes? Talk to a technician in your area by taking a look at service centers near you.