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Fault code P0447

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I got a check engine light which seems to be fuel level dependent as it came on the first time at 3/4 tank. I had a friend check the code with a Snap-on reader and he came up with

a 0447 code. His recommendation was to replace the filler cap. That was done and the light went away for a while. After driving through 3 tanks of gas over the last week or two, and enjoying the early fall, the light came on again last night, right at 3/4 tank. Does anyone know where to start looking? I will get the code read again tomorrow when shop opens. Does this Problem sound familiar?

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i believe the Porsche OBDII codes are listed somewhere on this site, but i'm not sure where.

you can always Google 'Porsche OBD codes P0447' and there will be tons of info. ;)

i don't think your problem is necessarily 'fuel level-dependent'. probably just a coincidence that the CEL came on when you were at 3/4s of a tank. the fix for this problem is probably an inexpensive one.

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