Diagnosing codes P0441 and P0455

[WeeYari]

P0455 is a code for a leak but I've only seen one of the codes for a small leak thrown by an improperly sealed gas cap. Not a code for a large or gross leak like the P0455 is, unless the gas cap is not even on.

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[truefusion]

Originally Posted by WeeYari

... unless the gas cap is not even on.

I jiggled the cap and it basically fell into my hand. I must've not tighened it the last time I pumped gas. I will reset the codes and consider this to be the reason (unless it comes back on), though I am still interested in some kind of diagram of my engine and surrounding area.

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