Chances are that your *purge valve in the engine compartment is malfunctioning, lives above/behind the alternator. There is also another suspect valve that lives on your filler neck behind the fender liner. Pelican has a tech article on replacing that one.
http://www.pelicanparts.com/techarticles/Porsche-996-997-Carrera/106-FUEL-Replacing_Your_Fuel_Line_Vent_Valve/106-FUEL-Replacing_Your_Fuel_Line_Vent_Valve.htm
When one or the other has a hard failure you will get a CEL. Most likely a P 0440 to p0455.
*
http://www.*********.com/gqk9vdn-porsche-911-purge-valve.html?utm_source=shoppingcom&utm_medium=pf&utm_content=sc&utm_campaign=*********+ShoppingCom&fp=pp&utm_term=Porsche+Purge+Valve
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2013 991.1 Carrera S Cab
2004 996 Turbo CAB X50 sold
2003 996 cab 6 speed Sold
1972 RS 3.2 twin plug short stroke crank fire, roll bar, sold
DE instructor since 1985
Last edited by FPB111; 11-03-2016 at 04:39 PM..
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