The contact owns a 2015 BMW X3. The contact received notification of NHTSA Campaign Number: 24V608000 (Engine and Engine Cooling, Electrical System); however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated there was an abnormal burning odor coming from the engine compartment. There were no warning lights illuminated. The dealer was contacted. The manufacturer was made aware of the issue. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The failure mileage was 120,000. VIN tool confirms parts not available.