NEW YORK (AP) - Fiat Chrysler said Saturday that it is recalling more than half a million more trucks in the U.S. to fix faulty impact sensors, a day after it announced an even bigger U.S. recall to update vehicles' software in order to safeguard it from hacking.The faulty sensors could cause seat belt pre-tensioners to activate and air bags to deploy unexpectedly, increasing the risk of a crash or injury, according to a statement posted on the U.