A check engine light is an indicator on a vehicle’s dashboard that illuminates when the engine control module (ECM) detects a problem with the engine or emissions control system. The light is typically yellow or orange in color and has the shape of an engine. When the check engine light is on, it means that the ECM has stored a diagnostic trouble code (DTC) in its memory. The DTC identifies the specific problem that has been detected by the ECM.
Checking the check engine light is important because it can help you to identify and fix problems with your vehicle before they become more serious. Ignoring a check engine light can lead to decreased fuel efficiency, increased emissions, and even engine damage. If your check engine light is on, it is important to have it checked by a qualified mechanic as soon as possible.