ag i too got a 3.0 e70 for the wifee about 6 weeks ago and have had the same prob ! she was getting the airbag malf and the tensioner's were'nt working (shes prego aswell)

took it in once they fixed it up 4 days , they changed sensors ,then about 2 weeks later again they keep it 8 days changing everything from airbags to the seat cushion's , this time cause i was throwing the lemon word around , then they let the head tech take it home for a 50+ mile drive just to make sure it was corrected and now for 3 weeks its been good but believe me if it happenns again that truck will have the fruit on the title !!

as for the others wondering what happens in these types of cases , bmw buys the car back and fixes but the title must say buy back lemon , which diminishes the value of the car by some 30+% due to resale value !

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2013 F10 M5
ALPINE WHITE/BLK/ANTHRACITE