human
What does it mean when a car has a "check engine" light on?
assistant
It means that the car's computer system is detecting an issue with one or more of its components. The check engine light can be triggered by a variety of issues, such as a malfunctioning oxygen sensor, faulty catalytic converter, or a failing fuel pump. If you see the check engine light illuminated, you should take your car to a qualified mechanic for further diagnosis and repair.