The propellant in some Takata inflators can burn too quickly, blowing apart a metal canister and sending shrapnel into the passenger compartment. The problem has been blamed for at least seven deaths and more than 100 injuries.
Last month Takata bowed to pressure from the National Highway Traffic Safety Administration and declared many of its products defective, agreeing to double the number of air bag inflators being recalled. It's now the largest auto recall in U.S. history. Some cars are equipped with both driver and passenger air bags made by Takata.
The recall expansion brings to 2.9 million the number of Toyota and Lexus vehicles being recalled in the U.S. due to the inflators.
Toyota said in a statement that it's committed to customer safety. "We will continue to respond promptly to new developments so we can resolve issues for them as quickly and safely as possible," said Dino Triantafyllos, chief quality officer.
The giant recall covers driver and passenger air bags in cars and trucks made by 11 automakers. Takata, the automakers and NHTSA are still trying to determine what exactly causes the inflators to malfunction.