The gas cap is one part of your vehicle that we bet you don’t give much thought to in spite of how often you use it. The thing is, a gas cap does a lot more than simply close off your vehicle’s filler ...

Q: I am having a problem with my gas cap that is creating an engine warning on my dash. I have been tightening the gas cap quite a few times. I will sometimes get it to clear the check engine light, ...

In a recent column, you talked about how a vehicle’s emissions system monitors itself for leaks. And that if a gas cap is loose and lets vapors escape, that will turn on the check engine light. Well, ...