DETROIT—The problem of exploding air bags could be widening beyond Japanese manufacturer Takata Corp.
U.S. safety regulators are investigating inflators made by ARC Automotive Inc. that went into about 420,000 older Fiat Chrysler Town and Country minivans and another 70,000 Kia Optima midsize sedans.
The probe, revealed in documents posted Tuesday by the National Highway Traffic Safety Administration (NHTSA), comes just weeks after Takata agreed to recall 33.8 million inflators in the U.S. in the largest automotive recall in American history. Worldwide, at least eight people have been killed and more than 100 injured by flying shrapnel from Takata inflators.
