Toyota has admitted it took "too long" to deal with safety issues which led to the recall of millions of vehicles worldwide.
Senior Toyota executives in the US are being questioned at congressional hearings into the car crisis.
The head of Toyota in the US, James Lentz, said that they failed to promptly analyse and respond to information provided.
The House Energy and Commerce Committee is also hearing from Rhonda Smith - who fought back tears as she told of a "near death" experience in October 2006 after the Toyota Lexus she was driving would not slow down.
Toyota president Akio Toyoda is also due to face questioning in US congress.
Mark Mardell reports from Washington.