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The first part made me think o2 sensor, purely based on reading about symptoms of a bad o2 sensor if it’s running rich. Of course, I’m basically a novice so keep that in mind. Also don’t know much about BMW, but on a Honda when I replaced the upstream o2 sensor (no code) it seemed to improve the fuel economy (which had been pretty poor for a while). Hopefully it’s the vac elbow / fuel filter issue only.