An acronym for "Check Engine Light" warning light on a vehicle's dashboard.
The Check Engine light is an indicator lamp placed on the vehicle's dashboard. Typically amber or red coloured, this malfunction indicator lamp (MIL) indicates a problem with the computerized engine management system. It often has an icon in the shape on an engine.
Note that if it is flashing on and off this means that a misfire that will damage the catalytic converter is occurring. In this case the engine should be turned and repaired before being returned to service.