 Ginny Kosola, Fox News. The National Highway Traffic Safety Administration is warning drivers about what they call cheap substandard replacement airbag inflators. They say can fail to prevent serious injuries or death in a crash. The agency says three people have been killed and two suffered severe injuries in the past nine months due to substandard aftermarket airbag inflators. It's urging people to buy used cars to get a vehicle history report. I'm Lisa LaSara. This is Fox News.