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P0455 is going to be the end of me. After changing the purge valve, I didn't get this code or the gas cap warning and was happy that I had finally fixed this 3 year problem. 282 miles later, bam!! Check gas cap and engine light! About to give up
This TSB discusses your not uncommon quandary. Nice long list of stuff to check.
We can only dream! But please if you do, Mr. Nesbitt, redesign a few things like the lca cage nuts, door water problems, easier head light bulb changes! Quarter panel rust !