Looking to tackle this issue pretty soon and looking for a bit of advice. It's not the gas cap i've tried 2 already, one from eBay but people made me paranoid about fake parts so I went to the dealer directly to get the 2nd. I took the over off under the trunk where the charcoal canister is and didn't see any disconnected or beat up hoses. What's next? Smoke test? Any advice is appreciated, thanks

 

Check the evap purge valve, and vacuum lines associated with it.

 

Swapped it out, cleared the codes and CEL came on about 20 miles later, P0441 came back but not P0455. Drove for another 40 or so miles and P0455 still didn't come back so it's looking like we made some progress at least. Anything specific for P0441?

 

Did you check the vacuum hoses to see if they're tight?

The one marked in yellow is easily pulled off the hard line. This happens because it's clamped under the intake tube. I've done it myself switching intakes on and off.

Check that location if it's actually connected to the hard line sufficiently. Also inspect the other lines for cracks where the clamps are positioned leading to purge valve and intake manifold.

 

You're a wizard
The line on the left was completely off and it was a pain to get back on but I was determined to not take the the intake off. Huge thanks and fingers crossed this was the only thing left