Toyota announced Wednesday that it would be adding about four weeks to the time it spends developing new vehicles, so that it can conduct more quality checks before introducing them to the public.
Toyota engines on almost 270,000 vehicles, 180,000 sold outside Japan, could stall while the car is moving.
Toyota said Wednesday it is recalling 4,500 Lexus vehicles in Japan. Another 7,000 vehicles in other countries, including the US, are also likely affected.
Sudden acceleration of Toyota recall cars will be the focus of the NASA investigation, probably not cosmic rays.
Toyota officials on Monday said they couldn't find any evidence to support the "runaway" Toyota Prius story
Toyota says a brief shift in its computerized braking system caused consumer concern. But consumer complaints show a potentially deeper problem.