u/kruzilla

Hey all,

I'm going a little crazy here. Our check engine light keeps going on every few days or weeks. We have a very honest mechanic and other than a faulty valve of some kind, he's found nothing wrong. He says we're probably not tightening the gas cap enough but this was never an issue before and I tighten it every time as far as it can go. Any idea what's going on?

Thanks.