Quote:
Originally Posted by josiahg52
I'd consider the boost pressure sensor, charge air temperature sensor and the MAFS. I had codes associated with some of these sensors but it ran terribly to the point that it eventually went into limp mode constantly with a few misfire codes. I believe my problem started with an EGR cooler issue. Or it's just old and I've put a lot of miles on it. I'm not saying throw parts at it, but take a look at them. I agree about the MAPS although mine looked great and still seems to be functioning.
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The way we discovered mine was Matt W. came over to my place with his 335d and we plugged in Carly's and compared data during idle. As soon as we looked pressure readings it stood out like a sore thumb. Ordered a new one and a few days later I was running good as new.
Also, it's not old and doesn't have too many miles. My 2009 had 220+k miles on it still ran great when I got rid of it. New owner has another 5k on it already and its still running strong. That engine is capable of 300k+ no problem if well maintained.