check engine light doesnt want to go off

[donjuan143]

could anyone tell me what might be wrong with my car, i took my car to the dealer three times and still i get the check engine light.
they have changed the mass air flow three time now!

i checked for the error codes and this is what i get:-

P0446
Porsche fault code 95 - Shutoff valve activated
charcoal filter (function)


P1128
Porsche fault code 360 - Oxygen sensing adaptation
idle range bank 1


P1130
Porsche fault code 361 - Oxygen sensing adaptation
idle range bank 2


PS my car was with the dealer for more than a month and they still couldnt fix it.

[KevinH1990]

I had the P0446 code. Replacing the purge valve and the charcoal canister in the fuel system eventually solved the problem.

The other two codes are:

P1128 Oxygen Sensing Adaptation Area 2 (Cylinders 1 - 3) - Rich Threshold

P1130 Oxygen Sensing Adaptation Area 2 (Cylinders 4 - 6) - Rich Threshold

Since they've replaced the MAF, it's possible you need to replace the two O2 sensors before the catalytic converters. I'm not an expert on this though.

I'm wondering why your dealer can't figure this out.

[sc00ter18]

Faulty O2 sensor

leak in the exhaust pipes.

catalytic converters

good luck

[Topless]

Looks like your car is running lean and the DME has trimmed the mixture to the rich threshold. Look for an intake air leak, or bad AOS bellows, or bad gas cap, and be certain the MAF was changed (old parts in hand).

Common dealer mis diagnoses: bad O2 sensors.