Ford Unintended-Acceleration Probe Upgraded by U.S. NHTSA

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An investigation into complaints that loose floor mats in some Ford Motor Co. Fusion, Lincoln MKZ and Mercury Milan cars may jam accelerator pedals was upgraded by U.S. regulators.

The National Highway Traffic Safety Administration, which regulates auto safety, today said it intensified a probe opened in May 2010 to an engineering analysis after receiving 52 complaints.