I have been lurking on the forums for some time now and recently purchased a 2008 Cayenne TT. I must say, I love the car, drives like a sports car despit 5,000+lbs!
Anyway, recently I had a CEL come on - no changes in the cars behavior, appears to start/run fine.
I borrowed a buddy's code reader and the following codes came back: P2404 and P0455. I believe these point towards a large evap leak. I went ahead and replaced the gas cap with no resolution (I did clear the codes and they returned in 1-2 days).
I wanted to get your opinion on what to do next. I did come across instructions on the replacement of the evap purge valve - should this be next?
Any help would be greatly appreciated. Feel free to leave instructions on how to complete any recommended repair - I am hoping to do this myself.