Auto repair and the things to learn
Employees can only interpret your car's stored trouble codes and are not trained to diagnose and repair the actual problem. (Your onboard computer stores messages, or trouble codes, in its memory whenever it detects a problem. ) There are several steps to a proper diagnosis of your check engine light. First, your technician will perform a scan test for stored trouble codes. Then, your technician will test sensors and other components to eliminate suspected causes.