BMW of North America (BMW) is recalling certain model year 2000-2003 525i Sedan, 530i Sedan, 540i Sedan, 2001-2003 525i Sports Wagon and 540i Sports Wagon vehicles, and 2000-2004 X5 SAV 3.0i, X5 SAV 4.4i, and X5 SAV 4.6is vehicles. This recall affects certain vehicles where the original steering wheel has been replaced with the optional sports steering wheel. The sports steering wheel has a frontal air bag inflator that may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, temperature and temperature cycling.