The contact's son owned a 2007 Ford Mustang. The contact stated that while her son was accelerating from a stop, another vehicle had crashed on the driver's side of the vehicle. The air bags did not deploy upon impact. The contact's son was knocked unconscious and taken to the local hospital. The contact's son was treated for a head contusion and bruising to his chest and abdomen. The other driving was taken to the hospital in critical condition; however, his injuries were unknown. A police report was filed at the scene. The vehicle was towed from the scene to an independent mechanic. The manufacturer was notified of the failure and they offered no assistance. A dealer was not contacted. The vehicle was destroyed. The failure mileage was approximately 140,000