The contact's customer owns a 2019 Kia Niro LX. The contact stated that his customer stated that the vehicle overheated. The check engine warning light was illuminated. The vehicle was taken to an independent mechanic who replaced the converter. The vehicle was repaired, but the failure recurred. The owner stated that the vehicle was randomly stopping. The vehicle was taken back to the independent mechanic. While test driving at 15 MPH, the brakes were operating as designed, and then after several attempts, the brake pedal was applied and depressed to the floorboard, and the driver crashed into a parked BMW X5. There were no warning lights illuminated. The brakes were inoperable. The air bags deployed. There were no reported injuries, fire or police report filed. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was not notified of the faikure. The failure mileage was approximately 144,800.