One problem related to side/window air bag has been reported for the 2005 Audi S4. The most recently reported issues are listed below.
Failure of the driver's side airbag during a front end collision while the passenger side airbag deployed-no one was occupying the passenger seat. The point of impact was center between the two headlights.
| Side/window Air Bag problems | |
| Front Air Bag problems | |
| Front Driver Side Air Bag Inflator problems |