Incredible Check Engine Light Ideas. Web consumer reports tells you what the check engine light means and what you should do when you see it. Web 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.

Is there enough oil in your engine? Web 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. Your oxygen sensor measures the amount of unburned oxygen in your vehicle’s exhaust system.