HINT: When the check engine warning light comes on, check the owner’s manual for specific instructions.
Because yellow “check engine” warning lights often show up on the instrument panel unaccompanied by any apparent symptoms, drivers may continue to drive their vehicle and blame the incident on glitches in the system. However, this should be examined by an auto technician at the earliest opportunity. The reason is the car’s onboard computer system receives information about the engine and other parts of the car from an array of sensors. If any of these sensors relay information about an abnormality, the “check engine” light will come on and the car computer can compensate.
The point is not to ignore the warning to the point where failure develops. Those little lights really do mean something, even if it only means there’s a loose connection somewhere. Don’t be in the dark.