Air Bag Light On problems of the 2015 BMW X3

Passenger occupancy sensor failure. Reported under warranty when problem was intermittent, was told nothing was wrong. Problem now persistent after warranty expired and failed state inspection, can't drive until it's fixed. This was a recall item on 2005-2010 X3's and seems to be a very common problem with many models and years of BMW. Car warns about passenger restraint system failure, red airbag light comes on. Constantly chimes while driving.