The other day I was pulling into the driveway at my work, and the check fuel cap light came on. I knew my cap was on, but as the manual says, and what any avg. person would think of doing is check it and take it back off and put it back on. Of course no changes while doing that, so had my brother check the code when I got home from work since he has the scan tool to do that. Of course it gave the code that there was a vaccum leak and to check fuel cap. He reset the light to turn it off and so far, it hasn't came back on. It's been a few days now, so I figured if there was something seriously wrong, the light would have came back on already. Was just wanting to ask, should there be any cause for alarm, or just wait and see what happens? I have heard of these lights coming on before, not necessarily on the focus, but on other cars, and it would just be a glitch. Still running great, so i'm thinking if it doesn't come back on then everything is ok. Please give me your input on this. I hate dealing with the dealer and won't unless I have to.