The recall of air bag inflators from Takata Corp., already the largest automotive recall in American history, more than doubled in size Wednesday.

The vast expansion is expected to send hordes of drivers into dealerships to fix their cars and threatens to stress automakers already dealing with upset customers.

The U.S. National Highway Traffic Safety Administration said that an additional 35 million to 40 million inflators from the Japanese auto parts company will be recalled, adding to the 28.8 million inflators already slated to be replaced.

The recalls will take place in five phases beginning this month and ending in December 2019, the agency said. The order in which recall notices will be sent will be determined by risk level.

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