Changing the oil is the most common maintenance you'll have to do on your car, but what happens when the check engine light ...

What Causes the Check Engine Light to Come On? Every vehicle contains many sensors designed to illuminate the check engine light, signaling something is not safe or not operating properly. Many of ...

While your check engine light is obviously meant for engine issues, it can often give you clues to problems in other parts of the car as well.

"The check engine light is designed to come on when a vehicle's on-board diagnostic system sees a problem that impacts emissions or drivetrain issues," said David Rich, CarMD technical vice president.