The 2000 Audi A4 has 3 recalls, all centered on the driver-side front airbag, which may fail to inflate properly in a crash and leave the driver without protection at the moment it is needed most.
Two of the recalls involve the airbag inflator module itself, which uses a propellant that can degrade and cause the bag to underinflate or fail to deploy when triggered by a collision. The third recall addresses a related but distinct path to the same failure: long-term moisture exposure inside the airbag assembly can interfere with proper inflation. In each case, the real-world result is the same — a driver who expects the airbag to cushion them in a serious crash may find that it does not, raising the risk of head and chest injuries that a functioning bag would have reduced.