Subaru of America (Subaru) is recalling certain model year 2003-2004 Legacy, Outback, 2006-2008 Impreza, Tribeca, 2006 Saab 9-2x, and 2003-2006 Baja vehicles originally sold or that have ever been registered in Arizona, Arkansas, Delaware, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia, or “Zone B.” These vehicles may be equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules, and used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the front air bags, these inflators may rupture due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.