Takata is adding 2.7 million vehicles from Ford, Nissan and Mazda to the long list of those recalled to replace potentially dangerous air bag inflators.
The inflators are a new type that previously was thought to be safe. Vehicles affected are from the 2005 through 2012 model years.
Takata inflators can explode with too much force and spew shrapnel into drivers and passengers. At least 17 people have died and more than 180 injured due to the problem.
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Takata uses the chemical ammonium nitrate to inflate air bags. But it can deteriorate when exposed to humidity and high temperatures. Previously the company thought inflators with a drying agent were safe. But the government says new tests show that some inflators with the drying agent pose a safety risk.
Drivers are urged to go to the NHTSA website and check if their vehicles are under recall.
The Associated Press contributed to this article.