Quote:
Originally Posted by mesutter
If it were an intake leak, I'd expect it to also trigger codes 1128 and 1130, which indicate a lean condition at idle. In my case, a small leak ONLY triggered 1128 and 1130. A defective or dirty MAF could send erroneous signals to the DME (ECU), telling it to lean out the mixture. There is a post on Rennlist indicating that in one case, changing the MAF did, in fact, solve this issue. Google "Porsche", "P1126" and "P1133".
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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.