I've got a 2012 911 Turbo S, and a few years ago I got a CEL for P0456 "Very Small Evap Leak". I ignored it for a while, clearing the code, but at the end of last year I was forced to reckon with the issue because I could no longer pass smog in California.

I'm hoping my experience will help fix this one a little cheaper and faster and save someone a lot of grief. In the end my indie mechanic (Heyer Performance, Mountain View, CA) changed three parts, after doing a smoke test with somewhat inconclusive results.

1. Changed the fuel cap to a new one and ensure three-clicks when closing. This fixes the problem for a lot of people. It didn't for me.
2. Changed the Fuel Vapor Leak Detection Pump (958 605 107 00). My local Porsche dealership recommended this as the common fix for this issue on 997's. It didn't work for me.
   
3. Finally, I read somewhere on the Internet that the Fuel Tank Vent (9A1 110 093 71) might be to blame. I didn't get my hopes up, but gave it a shot. I was expecting the CEL to come on again as it always has... but it didn't! The evap emissions readiness test completed successfully and I drove directly to the smog station!
   

Hopefully this helps any of you 997.2 owners out if you ever encounter P0456 or other evap system leak codes. It's most likely to be one of these three things. You don't need an engine-out to change any of them and the labor isn't too bad.

 

Replacing the vent hose also solved the issue on my 997.1TT.

 

Thanks for sharing, I am sure you will help someone out with this info.

 

thank you. I have this problem right now. where did you source the parts and what was your total cost?

 

Does this work for all vehicles? I drive a Chrysler Town and Country.







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