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Old 05-29-2011, 10:04 AM
UncleJ UncleJ is offline
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Location: Silicon Valley
Join Date: May 2006
Posts: 6,596
Mein Auto: '09 Cayenne "S"
I had a MAS/MAF problem that was "itermittent" in that it only failed part of the time, but did not always throw a code (according to the tech). Prior to that (like a week) I had the fuel return valve in the tank replaced -- it did throw a code, but I wonder if it was not the MAS/MAF that was the real problem. No matter, both were done and the car runs even better now -- with better mileage as well. The point here I guess is that some of these things can fail without throwing a code, or will fail part of the time. If this were me I would take it in to the dealer or a premium BMW Indy shop.
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