Quote:
Originally Posted by JFP in PA
Totally depends upon the year of the car and DME version; on a 7.2 DME the same codes indicate overly rich conditions, on a 5.2.2 the same codes are an overly lean condition per the factory OBD II diagnostics manual. And no, I have not idea why the did it this way, but that is the way they list them in the manual.
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Don't believe that is correct. According to one poster, the belief the 1130 and 1128 codes are caused by a rich condition on some DMEs is due to a poor English translation by Porsche. The code is set when the mixture goes too lean to be corrected by the enrichment circuit ("beyond the rich threshold") I have a 7.2 DME, and my codes 1128 and 1130 were apparently caused by a disconnected vacuum line (at least, they did not re-occur after the line was reconnected).
I could be wrong, but a quick call to a Porsche service department could likely give us the straight scoop.