NHTSA says its probe covers about 249,000 cars from the 2010 model year. There have been three complaints about pedals being trapped by all-weather floor mats. There are no reported crashes or injuries related to the condition.

Floor mats trapping the accelerator pedal was cited by Toyota as a key reason for reports of unintended acceleration in several vehicles. Toyota recalled 5.4 million cars to fix the floor mat issue.

The problem, NHTSA says, occurs when consumers stack the all-weather floor mat on top the standard carpeted floor mat. It says that the carpeted floor mat should be removed before installing the all-weather mat.

A Ford spokesman said the automaker does not recommend stacking the floor mats.

Ford Motor Co.'s Fusion and Mercury Milan cars are under investigation by U.S. regulators because floor mats may trap the accelerator pedals, the National Highway Traffic Safety Administration said.