Those symptoms are synonymous to a vacuum leak in the intake. A vacuum leak anywhere after the MAF sensor will cause a lean condition, of which the O2 Sensors recognize and compensate for by adding more Fuel to richen the mixture. This will max out adaption values in the computer and set fault codes.

I know the 3.0 X5's have intake boot failures, and I'm fairly certain you have the same issue with your 4.4.