DETROIT -- General Motors Co. plans to warn some owners of Saab 9-2X and Pontiac Vibe hatchbacks in the United States not to allow front-seat passengers until defective air bags are replaced.
GM's announcement comes after the U.S. highway safety regulator, NHTSA, expanded its warning on Tuesday about faulty airbags made by the Japanese supplier Takata Corp. to 6.1 million vehicles in the United States.
"The National Highway Traffic Safety Administration urges owners of certain Toyota, Honda, Mazda, BMW, Nissan, Mitsubishi, Subaru, Chrysler, Ford and General Motors vehicles to act immediately on recall notices to replace defective Takata airbags," the NHTSA said in a statement.
"Over six million vehicles are involved in these recalls, which have occurred as far back as 18 months ago and as recently as Monday," the organization added, revising a previous warning issued on Monday that said the recall covered 4.74 million vehicles.
The NHTSA issued an urgent public warning that cars with components made by Takata that are exposed to high humidity may deploy air bags with so much force a metal part could rupture and strike occupants.
GM and Subaru jointly built the Saab model. The Pontiac Vibe was built with Toyota Motor Corp.
Bloomberg and Reuters contributed to this report