The big fix for a potentially deadly flaw in some Toyota models should arrive at dealership doors by Thursday.
The steel reinforcement bar is designed to reduce friction in the gas pedal system that the manufacturer found can cause the pedal to stick.
The problem has been linked to 20 deaths and 2,000 accidents.
"We are truly sorry for letting them down," John Lentz, president and CEO of Toyota Motor Sales said. "Nothing is more important to us than their safety and their satisfaction and we're redoubling our efforts to make sure this can never happen again."
Some 2.3 million cars and trucks are affected by the faulty gas pedals. Another 5.5 million have defective floor mats.
Dealers are now learning how to install the new parts. Some shops plan to stay open around the clock to make the repairs and many owners are ready for peace of mind.
"I know what I'm supposed to do if it happens," said Toyota owner Pam Gregg. "So I just kind of keep an eye on it and tried to make sure I'm aware if it starts to happen."
Some dealers estimate it will take as many as five months to repair all of the recalled vehicles. It may take longer for Toyota to rebuild confidence in their products.
Consumer Reports, a popular buyers guide for car shoppers, has suspended its "recommended" status for the eight recalled Toyota models.
"They're at a point where their reputation is rapidly declining and the credibility is rapidly declining in a way where probably no one would have expected," auto analyst Sean Kane said.
Next week, a House oversight committee will hold hearings on the issue.