What is Check Engine Light?
The Check Engine light — more formally known as the Malfunction Indicator Lamp (MIL) — is a signal from the car’s engine computer that something is wrong.
Check Engine Light On Mean?
The reasons for a check engine light on range from something as simple as a loose gas cap to something as serious as a faulty catalytic convertor. Below is a list of a few of the possible problems that could cause your check engine light to activate.
Loose gas cap
Problem with the MAF sensor or circuit
System running too lean or too rich
Knock sensor circuit malfunction
Insufficient EGR (Exhaust Gas Recirculation) flow
Catalyst system efficiency below threshold
Faulty oxygen sensor