97' Base, 104K, Tip.
June 3rd,
CEL light comes on. Durametric shows-
P0420, P1102, & P1107.
I repalce the 2 pre cat O2 sensors, which I had planned on doing anyway as maintenance.
Reset codes, drive 75miles with no CEL. Just as I arrive home CEL light back on.
Now I have P1115 & P1119 ( heating power ahaed of Cats on both banks.
Feeling a little helpless at this point I take car to local Porsche shop. After $515 of diagnostic labor, they say the 2 O2 sensors are NG, and that there are a lot of counterfeits out there, and I probably got 2... I am skeptical but trust these guys. I'm attaching receipt with notes from shop.
I buy 2 more sensors from a different source and install them. Reset fault codes. Go for another 50 mile drive and by the time I am home the CEL light is back on. Now back to P1102 & P1107 again.
( O2S heating power ahead of cat on both banks exceeds limit value.)
I have to solve this w/o spending another $500 in diagnostics. Electrical issues not my forte, and I fear something crazy in the harness at this point.
MAF sensor? Vacum leak? Any thoughts and suggestions deeply appreciated.
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