 According to Carfax, in just the last two years, two million vehicles went back on the road after a crash where the airbags deployed. And some of those cars, no one knows how many, wound up with cheap counterfeits as replacements. Safety regulators say if your car ever had its airbags deployed, and check a vehicle history report if you aren't sure, visit a reputable mechanic or a dealership for an airbag inspection.