I hate to be that person but.. do a search for that code. Mine was the tank venting valve, but to also warn you, there's two styles. I replaced it (and it's super duper easy as it's right on the front top of the engine) and.. all good.
I did out of curiosity get a small camera into the hole and I saw the tear in the diaphram so it made me happy that I didn't just chase a ghost.
Part was like $90 straight from the dealer.
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