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NHTSA probing 500,000 Ford vehicles

US carmaker, Ford Motor Co has said the National Highway Traffic Safety Administration (NHTSA) is investigating some 500,000 of its vehicles for steering problems, Reuters has reported. The vehicles include Ford’s Crown Victoria, Grand Marquis and Marauder from model years 2004 to 2007. The regulator is investigating an issue related to a heat shield in Ford cars that can rust, dislodge and cause the steering to jam.