wow that's very rich. Rich on both banks; i would first check the basics; what is fuel rail pressure? it's uncommon for the MAF to be off but both your banks are quite rich so it's systemic even if only one bank reported an actual error code. Look at your realtime MAF numbers and maybe find the xo thread where people reported their MAF readings for control comparison.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)