The contact owns a 2016 BMW X3. The contact stated that while driving approximately 75 MPH, the vehicle unintendedly decelerated and failed to properly accelerate. The vehicle was taken to the local dealer, who was unable to determine the cause of the failure. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was offered. The contact was informed that the VIN was not included in NHTSA Campaign Number: 21V586000 (FUEL SYSTEM, DIESEL). The contact stated that the vehicle had experienced the failure listed in the recall. The failure mileage was 55,000.