The passenger frontal air bag assembly is deployed by an inflator which contains propellant that makes the air bag deploy. This propellant may degrade over time, especially when exposed to humidity and temperature cycling. As a result, the inflator may rupture on deployment, which can send metal shrapnel through the air bag, striking vehicle occupants. This could result in serious injury or death.
The air bag control unit may corrode and fail to operate properly, resulting in air bags not deploying as needed in a crash. This would increase the risk of occupant injury.