Interested in this topic...
My shop replaced the door handle mechanism on my X5. Airbag light on since driving away. I took the car back in yesterday. I was told various codes for the airbag light. They could try new controller unit to see if it makes the light go away. Cost: $700 if it works. Else, addressing all the things that the codes say would cost ~$1300. I'm mostly convinced the airbag light came on as a result of the shop do the work to replace the handle mechanism. Anyway, I paid $45 yesterday for the shop to read the codes and I told them I'd take the car without having them attempt to fix it.

I guess I'll take the door panel off myself and take a look see. Mainly, I'll make sure the airbag is still plugged in and wiring looks ok. I already tried resetting the airbag light with the Peake tool but the light comes back on immediately after each reset.

Any additional things for me, and Traveldad, to look for?