Chevrolet fault code readers (also known as OBD2 scanners) will diagnose & clear fault codes from your engine module and allow you to remove & clear the engine light or MIL light from your dashboard. The tools have integrated screens and will read out the Chevrolet problem or trouble code, and are a must for any owners toolbox if you are looking to fix your Chevrolet. You can also find live data, o2 sensor data & freeze frame data. Uk Pro Diagnostics is the number 1 place to buy an OBD2 scanner online.