What does the Check Engine Light mean?

The Check Engine Light (also called Malfunction Indicator Lamp or MIL) indicates that the vehicle's on-board diagnostic system has detected a problem with the engine, transmission, or emissions system. A steady light suggests a non-emergency issue that should be diagnosed soon. A flashing light indicates a severe problem—typically an engine misfire—that could damage the catalytic converter and requires immediate attention. You should use an OBD-II scanner to read the specific diagnostic trouble code (DTC) to identify the exact issue.