TL* THE CONTACT OWNS A 2011 KIA SORENTO. THE CONTACT STATED THAT WHILE DRIVING AT 30 MPH, THE VEHICLE AHEAD STOPPED SUDDENLY WITHOUT WARNING. AS A RESULT, THE CONTACT CRASHED INTO REAR END OF THE VEHICLE. THE AIR BAG FAILED TO DEPLOY. THE DRIVER SUSTAINED A HEAD INJURY THAT REQUIRED MEDICAL ATTENTION. A POLICE REPORT WAS FILED. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. IN ADDITION, THE CONTACT MENTIONED THAT 24,000 MILES AFTER THE FAILURE OCCURRED, THE AIR BAG WARNING LIGHT ILLUMINATED. THE VEHICLE WAS TAKEN TO THE DEALER WHERE IT WAS DIAGNOSED THAT THE CLOCK SPRING AND THE FRONT PASSENGER SIDE SEAT AIR BAG SENSOR FAILED AND NEEDED TO BE REPLACED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 60,000. THE VIN WAS NOT AVAILABLE.