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First of all hello, I have a 2008 cayenne gts with 75000 mi. My engine light comes on with the code p0455 so far its been smoke tested, new gas cap, new leak detection pump still I get the same code p0455 anyone have a clue or had a simular problem where they couldnt figure out whats wrong?
 

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P0455 Evaporative Emission System Leak Detected (large leak) Possible cause of fault - Tank cap not tightened correctly, faulty or missing - Mechanical fault in EVAP canister purge valve (does not close fully) - Leakage diagnosis pump leaking internally (membrane) or externally - Mechanical fault in EVAP canister shutoff valve (does not close fully when power is supplied) - EVAP canister shutoff valve connections leaking - Tank system (including pipes) leaking Check your gas cap and seal. There have been some changes to the gas cap so you might want to make sure you have the latest revision.
 
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