U.S. safety regulators upgraded a probe of about 480,000 Ford Motor Co sedans to examine floor mats that may interfere with the accelerator pedal, according to documents filed on Friday.
In 2008-2010 Ford Fusion, Mercury Milan and Lincoln MKZ sedans, unsecured or double stacked floor mats under the driver's foot well may block the accelerator pedal from returning to idle.
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The National Highway Traffic Safety Administration said it upgraded its investigation to an engineering analysis to further assess the scope of the problem.
(Reporting By Deepa Seetharaman)