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Old 08-30-2008, 08:42 AM
skylolow skylolow is offline
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Location: Wisconsin
Join Date: Mar 2008
Posts: 1,007
Mein Auto: 2004 545i Sport with SMG
Well took my in Friday and it turned out to be the DMTL Pump part of the fuel system.

Service agent told me it quite common as there is a small valve/flap in this part that once in awhile sticks and sets off the error code FC 27 CB. According to him it usually just unsticks itself but the error code is there. So since it was covered under CPO they just replaced the DMTL Pump.

Asked him about the increased emissions warning and he said its usually a O2 sensor (4 of them I believe are on the car) or its this DMTL Pump. One of those two he said is the reason 90% of the time.
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