The contact owns a 2007 LINCOLN MKX. The contacts husband stated while driving approximately 35mph when the driver side airbag inflated without warning which resulted in the contact's husband to lose control and crash the vehicle into a vehicle in front. 4 persons were injured (the contacts husband and 3 other individuals that were in the other vehicle) the occupants in the other vehicle went and sought medical treatment (contact does not know the type of injuries) while the contact's husband did not seek medical treatment for bruising. A police report was filed. The vehicle was towed to a police lot. The contact stated no warning lights were illuminated. The vehicle was towed to an unknown dealer and diagnosed but not repaired. The manufacturer was not informed of the failure. The failure mileage was approximately 205,000.