Toyota officials on Monday said they couldn't find any evidence to support the "runaway" Toyota Prius story
The report had threatened to overshadow Toyota's attempts to restart sales after a punishing series of recalls.
National Highway Traffic Safety Administration engineers drove the hybrid in an effort to recreate the episode reported by the driver, James Sikes, but were unable to do so, the agency said in its first statement on a hurried and high-profile analysis.
"We would caution people that our work continues and that we may never know exactly what happened with this car," NHTSA said.
Sikes, 61, had reported in a call to emergency telephone operators that his Prius was racing out of control for some 20 minutes before he could slow down the vehicle and bring it to a safe stop with coaching from a California Highway Patrol officer who pulled alongside him.
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