Nissan Motor Co said on Friday it would expand an investigative recall in certain U.S. regions to replace air bags made by Takata Corp , adding about 45,000 Sentras from the 2004-2006 model years that weren't included previously. Japan's second-largest automaker has informed the U.S. National Highway Traffic Safety Administration about its plans to replace passenger-side air bags of the affected Sentras, a spokesman said.