Some 34-million cars in the United States have been recalled amid fears over potentially deadly air bags.
Their Japanese manufacturer, Takata Corp, is doubling its recall, making it the largest automotive repair of its kind in US history.
The recall involves passenger and driver-side air bag inflators in vehicles made by 11 automakers, the U.S. Department of Transportation, the National Highway Traffic Safety Administration.
Regulators have linked the defective material to six deaths worldwide with exploding Takata air bags spraying shrapnel into vehicles.
Kelley Blue Brook analyst Jack Nerad said: “It has huge significance. It will probably take years to get this completed and the likelihood is it will never be completed 100 percent.”
It is understood in total some 53-million vehicles worldwide are affected but Takata is refusing for now to name which markets, outside the US, will next fall victim to this measure.
Takata faces multiple class actions in the US and Canada as well as criminal investigation and a regulatory probe.