The light could be a minor issue, such as a faulty gas cap, or it could mean something more serious, such as a misfiring engine. ... The check engine light — more formally known as the malfunction indicator lamp — is a signal from the car's engine computer that something is wrong.

What could cause the check engine light to come on?

Spark Plugs

Finally, worn spark plugs or plug wires will result in a check engine warning. Just about anything wrong with your vehicle's ignition system will likely cause your check engine light to come on. ... Stalls are another indicator of spark plug trouble.

Is it safe to drive your car with the check engine light on?

The rule of thumb is that if the check engine light is flashing, you can't keep driving the car. It's an emergency. Often it indicates an engine misfire. If you keep driving, you will likely cause irreversible damage, mostly to the (expensive) catalytic converter.