When the check engine light comes on in a vehicle, it’s indicating that there is some issue with the car that should be checked out. It could be something minor, such as the gas cap not being screwed ...

How to determine whether your car has a loose gas cap—or a serious engine problem This is what the check engine light looks like. By Consumer Reports You’re driving along in your car or truck and ...

Onboard diagnostics (OBD) systems have been around since the 1980s and were developed to help limit harmful automotive exhaust emissions. Between 1988 and 1995, U.S.-built vehicles came with what's ...

Modern-day vehicles are equipped with numerous sensors designed to monitor every aspect of the car. If one of these systems detects an issue, it is likely to trigger the warning system, which will ...

Here are 2025's most popular questions and answers from The Journal's Car Doctor column, from rotating tires to oil changes.