At a glance
What can fail
The side curtain airbag inflator can rupture and break apart unexpectedly. Metal pieces could be launched toward occupants, and the airbag may not inflate properly in a crash.
What the fix does
BMW will send you a notice. Take your vehicle to a dealership to have the side curtain airbag(s) replaced as needed.
Summarized — see the official notice for exact wording, dates, and contacts.