gas cap

Try filling the tank up with high quality gas and click the cap tight. Maybe it will turn off after a while. If its not causing problems with drivability then it should be ok for now.

if a loose or leaking gas cap was the problem, go to a dealer and request the code to be cleared. it may cost a few bucks.

you need to replace a part that is located up in left rear quarter 2 screws and change lines parts were 20 some from dealer easy fix

Purge canister in the rear quarter panel is bad. Get one at NAPA.