Originally posted by Gladiator:
Yay, I did the battery disconnect this morning. Now the light is off...
It will take a few days (drive cycles) for you to be certain the previous fault was just a momentary glitch. Don't be surprised at all if it comes back. If it does, just go to your nearest AutoZone (or equivalent), ask them to pull the codes for you, take note of all the codes that are shown, and come back here. Only then will we have the vaguest idea what you're up against.
And yes,
the gas cap is indeed part of the emissions system.
