BMW issues warning on older models with faulty airbags

BMW is warning owners of about 90,000 older vehicles in the US not to drive them due to an increasing threat that the airbags might explode in a crash. The warning covers vehicles from the 2000 through 2006 model years that previously had been recalled to replace faulty and dangerous airbag inflators made by Takata. The company used volatile ammonium nitrate to inflate the airbags in a crash. But the chemical can deteriorate over time when exposed to heat and humidity and blow apart a metal canister, hurling shrapnel that can injure or kill drivers and passengers.