Shop OEM BMW Part # 72127239399 (72-12-7-239-399). Curtain Air Bag (Left). 4 Series; Left. 430i, 430i xDrive; Coupe; Left. 440i, 440i xDrive; Coupe; Left. AIR BAGS. M4; Left. Air Bag

Head. Air. Curtain. Bag. Inflator.
The Air Bag Inflator module mounted to The roof line area of a vehicle.

Curtain Air Bag

4 Series; Left. 430i, 430i xDrive; Coupe; Left. 440i, 440i xDrive; Coupe; Left. AIR BAGS. M4; Left.
Air Bag Inflator Module - Repair or Replace
A very specific set of circumstances may require the replacement of your air bag inflator. If these apply to you, it's best for you and your to have a factory trained technician replace your air bag inflator module.