BMW Airbag Sensor after car crash and airbag deployment can by locked and must be replaced,.Even after small accident Airbag sensor will write in internal memory special error message"crash data stored" or "computuer fault" and after you need to exchange every expensive sensor to new one.
With BMW Airbag Reset Tool you can reset and repair Airbag computer in your office in 1 minute, no need to remove airbag sensor from the car.

Connect this tool to BMW car OBDII Connector or BMW 20Pin diagnostic connector