The contact owns a 2019 Ford F-150. The contact stated upon starting the vehicle, there was an abnormal rattling sound coming from the engine compartment. The contact stated that the engine was idling roughly. There was no warning light illuminated. The contact had not taken the vehicle to a local dealer or an independent mechanic. The vehicle was not diagnosed or repaired. The contact related the failure to Ford Campaign Number: 21N03. The manufacturer was informed of the failure and referred the contact to the NHTSA Hotline. The failure mileage was approximately 108,000.