The contact owns a 2016 BMW 528i. The contact stated that while his partner was driving at undisclosed speeds, there was smoke coming from the engine and entering the cabin through the vents while the heater was activated. There was an abnormal burning odor entering the cabin. The contact also observed the burning odor while driving the vehicle. There were no warning lights illuminated. The contact received notification of NHTSA Campaign Number: 24V608000 (Engine and Engine Cooling, Electrical System); however, the part to do the recall repair was not yet available. The local dealer was not contacted. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The failure mileage was approximately 80,000. VIN tool confirms parts not available.