I was checking the air filter the other day to see what the condition was, looked good so I put it back in. About 3 hrs later the CEL came on, shortly after that I noticed alot of bucking and hesitation... and it's getting worse, it will barely idle and its died 3 times. The CEL is reading as a MAS problem, low voltage I think. I checked for loose wires or if I unplugged something--nothing that I can see. Any Ideas, I doubt the MAS is so sensative it will die after having a filter change.

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2001 A4 1.8TSTip, DD
2004 GTO, A4(Auto), LS1, DD when my DD is broken

nothing, not even a guess?

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2001 A4 1.8TSTip, DD
2004 GTO, A4(Auto), LS1, DD when my DD is broken

did you remove the mass air by any chance while cheking the filter

maybe you did sometihng to your MAF sensor...i really don't know sorry

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did you loosen any pipes/unplug the maf and switch the ignition on, ensure all pipes are tight

old post but,with the car running tap on your purge valve,it sits on the air housing,it'll tell ya right then if it's bad,same happened with mine.