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2000 Porsche Carrera fueling, buzzing / whine, etc questions.....

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Ive got two errors P0410 and P1411 which are the secondary air injection. I visually checked the pump, hoses, etc and they all seem to be intact with no issues. Now since this is a 2000 it uses a different Change-Over valve...haven't gotten around to replacing that yet. But anyways Im also getting that gas tank buzzing sound at idle (traffic, slow moving, etc) and I believe its either the gas tank cap, fuel purge or something inside the engine bay. I believe that started first and that's about when I started getting check engine errors. Would it be possible that the fuel purge or breather could also be triggering those codes? It probably wouldn't but figured I ask. Also when the buzzing occurs Ive removed the gas cap and its still on. Eventually it will stop but will come back. Also noticed that when filling up the car it would stop as its a full tank but when I get into it its like a quarter below full. So I don't think its a gas cap issue but either the fuel breather or that other valve in the engine bay. Can anyone confirm this. Thanks.


Gee's if its not one thing its another!!!

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Could be as simple as a vacuum system leak - have you checked for that?


Hi Loren,


I checked all the hoses that I was able to see without taking anything apart for the secondary air injection codes with nothing out of place broken, etc.... I was using the diagram Ive attached. Now since this is a 2000 996 the Change-Over Valve is different (I learned the hardway). Part# 2 and 4 are combined now. Pump kicks on just fine.


Now going back to the second issue with the fuel system. Its making the wooing sound and when filling up the tank it clicks as its full and its not. So in that case for sure it would be the Fuel Vent Valve right?


Edited by Johnny-5
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