A check engine light indicates problems with your vehicle's emissions system. While you can turn the CEL off yourself, that's not the whole story. The post How Do You Reset the Check Engine Light ...

Here are our pro tips for diagnosing a check engine light. Head to your local auto parts store and rent an OBD2 scanner to see what’s what. The staff will also help you read the code.

A check-engine light could be a gentle reminder or a sign of something catastrophic. We explain what a malfunction indicator light is and what you can do about it.

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.

So what’s a Fox-body owner to do when the Check Engine light comes on or stays on while driving around? Check for trouble codes of course.

To convince the transmission control module that a working automatic was still installed and clear the fourteen-odd diagnostic codes, [Dean] put together a block of eight common automotive relays.

The check-engine light is a signal that the onboard diagnostics system (or OBD II) has detected a malfunction in the vehicle's emissions, ignition or fuel systems.