The United States National Highway Traffic Safety Administration is probing whether Ford Motor Co. did enough in recalling Super Duty pickups over stalling complaints. NHTSA said on a notice posted on its Web site that the probe entails around 200,000 MY2011-2012 F-250, F-350, F-450 and F-550.
One of the affected owners complained that a warning light indicated “Stop Safely Now” while driving, and the truck lost all throttle response and stalled. It had to be towed to a dealer for repair.
According to NHTSA, an exhaust-gas sensor located behind the diesel particulate filter in the exhaust systems may fail to function, resulting to warnings and sudden engine shutdowns. Safety regulators said the probe was prompted by around 30 consumer complaints.
Ford recalled around 3,000 Super Duty trucks – those sold to be customized as ambulances -- in October 2013. When the exhaust-gas sensor malfunctions, vehicles would emit audible chimes five times before shutting down.
NHTSA said the trucks couldn’t be immediately restarted. Even after the recall, NHTSA said it was still receiving complaints on trucks both covered and not covered by the callback. Some complaints say sensors have been replaced multiple times and that their trucks became disabled while on the road.