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Hey thunder, I wanna ask another question; when I got this truck, the engine light was not on. I took it to autozone and the computer said it is the gas cap. I noted that the little thing that looks like a rounded door in that canal where you put the gas pipe to pump gas in it was there. When I was done pumping gas and retired the pipe, the little rounded door didnt go back to its place. I am wondering if that is the reason why the engine light is on.
yea its an evap leak. 422 is a small one and 455 is a large. ive got the same one and i havent done anything with it. no issues. it could be your evap canister hoses that are split.