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DME Fault codes (not OBD2 codes)


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Loren.

Do you have a list of Porsche DME fault codes? I don't mean the OBD2 codes, but the ones that are referred to in the workshop manual. The only manual I have access to is an early one, and I wondered if they have issued an appendix with a decent list of codes.

I have DME error codes 27 and 35, which correspond to OBD2 codes P1123 and P1125. Thing is, the CEL doesn't come on and the car runs perfectly at all times. I think the fault must be intermittent and doesn't exist for long enough for the CEL to come on. I was hoping the Porsche codes might give me a bit more of a clue.

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According to the manual:

27 Oxygen sensing, area 1 Cylinders (1 - 3), P1123 (Short to ground below lower limit/lean mixture threshold) - MIL is on, emission relevant fault

35 Oxygen sensing, area 1 Cylinders (4 - 6), P1125 (Short to ground below lower limit/lean mixture threshold) - MIL is on, emission relevant fault

Possible trouble areas:

- Fuel pressure too high.

- Fuel injector leaking.

- EVAP canister purge valve open.

I'll try to get the Fault Text table online in the Pcode area in the next few days. It doesn't have solutions but it does show how the codes relate to each other.

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