Close to 10 million inflators with the highest risk of rupturing remained in use as of the end of March, analysis finds.
NHTSA chief believes a complete recall would strain the network for replacement parts and increase consumer uncertainty.
Covers vehicles from model years 2006 to 2014.
More Takata trouble for 2005 to 2014 model years.
Automaker joins Honda, Toyota and Nissan in deciding against putting the troubled inflators in their cars.