I have 2011 Jeep Wrangler 4 door jk. 130k miles. The gas cap light keeps turning on along with the check engine light. I changed the gas cap twice. I changed the fuel gas cap cover because the rubber ring was ripped, Changed the evap emissions detection leak pump and the canister purge valve. Codes keep popping up for P0456 and P0455. I cleared the check engine light but the gas cap keeps reading open and the check engine light comes back on. The gas cap lid I was using for a few years was a locking cap and the locking mechanism seized up on me but good thing it was unlocked so I did not have to pry it off. I also have trouble keeping the gas pump pumping on automatic at the gas station. The gas cap problem started happening a week after I had my exhaust manifold worked on (not sure if it’s related). Any thoughts?
Thanks for the tip. I’ll ask around if anyone I know can help me with the smoke method. I’m trying to save every buck I can finding the problem before I go get raped by a mechanic lol. Thank you again.