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

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 your car’s way of alerting you that something's amiss — but it could be as minor as a loose gas cap, or more serious, like a faulty oxygen sensor. Repair costs for ...

If your check engine light flashes and then stops, it could signal a serious issue. Learn what it means and what steps to take next.

But the check engine light could indicate a much more serious problem, such as faulty ignition. The problem could be minor, or it could be a risky malfunction that would not only be costly, but ...

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.

In some cases, the light changes from yellow to red or orange to indicate a more serious mechanical problem. Click here to see the 20 most common reasons for a check engine light.

Problems with catalytic converters are the most common issues that caused Check Engine Light alerts in cars last year and came with a hefty repair bill.

A The warning light in the lower left corner of your dash is the "malfunction indicator lamp," known in generic terms as the check-engine light.

Does a check-engine light really mean something is wrong with your engine? What you should do if yours comes on.