CEL P0441 '04 Cayenne S 48k mls

[lintakoc]

so i was driving yesterday and the CEL came on. drives fine..but i was low on gas and read that sometimes that brings the CEL on. this morning i go to get gas and as soon as i am done, the car wont start. doesnt even get above 200rpm when trying to turn. then the battery warning light comes on. i got it jumped and drove to autozone...where they pulled the code P0441. apparently a loose fuel cap (it was loose :/). we tested the battery and he said it was fine, 12 volts and enough charge. i started it and turned it off 4 or 5 times and it had no problem.

anyone have any idea why it would not start at the gas station? its 4 years old and still on the original battery. and also any insight on CEL P0441 would be greatly appreciated. thanks.

another random note is..sometimes when the car isnt warmed up-the sound system wont work. ill have to drive to where i am going then come back and start it up and it usually works by then. is this battery power related?

Edited December 2, 2008 by lintakoc

[jagman]

Not sure which years exactly but some early Cayennes had a second battery in the back also one under the drivers seat. If yours has two maybe they checked one and not the other? A bad cell in a battery will also cause it to check good at times. There is a large ground cable at the fron battery could be loose. MOLL batteries arent particularly tough so I would start in that direction. Also you colud have someone check fuel pressure maybe there was trash in the filter. Hope this helps. If I come up with anything else I'll post it.

[lintakoc]

does anyone know how to clear the CEL to see if the loose fuel cap solved the problem? the car seems to drive fine but the CEL is still on. thanks in advance.

[pokerjarvis]

I've had the same CEL issue twice. Both times stemmed from fueling the car while it was running. Once I did it; once my wife did. I've resorted to putting a small sticker on the fuel door release to remind me/us to shut the car off before removing the gas cap. The CEL light went off by itself after a day or two.

[lintakoc]

sorry to be somewhat repetitive..the CEL still hasn't gone off and the engine seems to be holding gears...it will hold D4 at 2500rpm or so and unless i accelerate quickly it will not move into 5th. anyone else experience this issue? thanks...

[RFM]

Time to hang the truck on a PIWIS IMHO.

[lintakoc]

okay...so really weird issue.

after filling up at the gas station, car tries to start..rpms go to about 2000 and then engine dies. i have to sit and manually rev the engine and keep the rpms above 3000 or else it will die. after it idles on its own...car runs like normal.

drive it everyday with no issues for about three weeks, CEL still on..but car drives fine so i think no big deal. then i go to fill it up...car wont start again at the gas station. this is immediately after i fill up-which is really random. after getting her to idle on her own after a few minutes of cranking and revving...runs fine (until presumably i have to fill it up again). i filled it to full both times.

ANY IDEAS?!? this is random..

[Loren]

As RFM said you need to put the car on a PIWIS tester.

[lintakoc]

As RFM said you need to put the car on a PIWIS tester.

i took it to the dealership, but any ideas on where i would be able to find a PIWIS tester anyways?

[Loren]

Dealers, independent shops and few DIY'ers have PIWIS testers. They about $18,000 leased from Porsche (and about $10,000/year after the initial contract).

They are a specialty diagnostic tool for Porsches.