BMW of North America (BMW) is recalling certain 2000-2002 325i and 325xi Sedan, and 323Ci, 325Ci, and 330Ci Convertible vehicles. This recall affects certain vehicles that may have had a driver-side air bag module installed as replacement equipment such as after a vehicle crash necessitating replacement of the original air bag, or as a remedy part for a prior recall. The frontal air bag inflator may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, temperature and temperature cycling.