You may have just diagnosed your own problem, at least I hope this is the case. If you did not tighten the fuel cap appropriately the last time, it would not have neceassarily given you the CEL immediately. If it does go away in the next few driving cycles, then that's what it was or if you want to find out right away, then re-set your ECU by pulling the ECU backup fuse under the dash for 30 seconds (with car OFF). If it was the gas cap, the light will NOT come on again (assuming you have since tightened it). If it is a sensor problem elsewhere, the light will most certainly come back on, in which case you need to have it looked at.

 

YEP! Problem Gas Cap not tighten. They reset the ECU. Thanks all!

narif

 

Glad it was something simple!

I believe the magic # is THREE. Three clicks at least. I think it even says it on the gas cap