NEW YORK (CNNMoney) -- An intensive 10 month investigation into possible causes of unintended acceleration in Toyota cars found no fault with the automaker's electronic throttle control systems, the Department of Transportation announced Tuesday.
So far there are three known causes of unintended acceleration in Toyota vehicles: improperly installed floor mats, sticky pedals, and driver error.
U.S. Transportation Secretary Ray LaHood said, "We enlisted the best and brightest engineers to study Toyota's electronics systems, and the verdict is in. There is no electronic-based cause for unintended high-speed acceleration in Toyotas."
NHTSA enlisted the help of NASA scientists and engineers. The agency said their expertise in areas such as computer controlled electronic systems, electromagnetic interference and software integrity would be a big help.
Despite a string of recalls for other problems, Toyota has long insisted that the electronic controls in its cars are safe.
"We believe this rigorous scientific analysis by some of America's foremost engineers should further reinforce confidence in the safety of Toyota and Lexus vehicles," Toyota's chief quality officer Steve St. Angelo said in a company statement.
READ MORE FROM CNN: Toyota sudden acceleration report finds no electronic flaws - Feb. 8, 2011
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