hi guys. I have a problem with a bmw 320 d e90 2005 with 120kw. made a diagnosis and I have an error relative to the air mass meter with the code 3ff1. sobbed to a minimum, not always, and then goes and then comes back. in the street equally, hiccups and loss of power with fumosit? black,then goes and then comes back. I noticed that if out the meter the hiccup goes away and comes back just rejoin the spinet.I also noticed that ? dirty engine oil and I checked out the game of the turbine, a bit of play in the wheel, but looking at the impeller, it all seems intact. one other thing, I noticed that stays the regulator of the geometry even with the engine off and the picture off, for at least a quarter of an hour. you know me some advice. thanks in advance