By Vicki Needham - 04/19/10 02:00 PM EDT
Toyota waited almost four months to report the pedal defect to the National Highway Traffic Safety Administration. The fine is the largest ever civil penalty assessed against an automaker by the NHTSA.
The Transportation Department launched an investigation Feb. 16. NHTSA officials are continuing to review Toyota's statements and more than 120,000 pages of documents to determine whether the company has complied with its legal obligations.