DO what Jazz said first. After that, is on to the MAF and O-Sensors. You did not mention the mileage but if your up into the 120k range, I would also include that in your thinking. If it were me, I would change the Crankshaft Position Sensor, actually there are two of them and then reset the codes. I like to do this a few times to make sure the BMW OBD is really serious about the codes it is sending or just fxxking with you. The previous comment applies to a car that is basically running ok.
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