Step by step to properly use the OBD2 scanner. Step 01: Make sure the car is turned off. Locate the data link underneath the steering wheel. It’s a wall outlet that allows the use of a special diagnostic computer, which most vehicles are sure to drive.

An OBD2 scan tool can communicate with these sensors, retrieve stored data, and even change a few settings on some cars. These scan tools are incredibly useful when it comes to figuring out why your check engine light is on and diagnosing engine problems.

The tool will then begin to interact with your OBD II system. Information is transmitted from the sensors to the scanner through the port. Once the reading is complete, the collected data will be available for you to review. How to Use an OBD II Scanner.