What does the Check Engine Light mean?
Quick Answer
Read the warning behavior and vehicle symptoms together. A code or a steady light alone cannot determine whether driving is safe.
The malfunction indicator lamp reports an emissions-related concern detected by the vehicle. Flashing can indicate a serious misfire and possible catalyst damage; follow the owner manual and arrange prompt service. A steady lamp does not by itself establish that driving is safe. Severe shaking, overheating, oil-pressure warnings or brake/steering symptoms require separate attention. Save codes and freeze-frame data before clearing anything.