The contact owns a 2015 Kia Forte. The contact stated that upon starting the vehicle, the vehicle made an abnormally loud rattling sound. The check engine warning light and other unknown warning lights were illuminated. The contact stated that there was a strong fuel odor coming from the vehicle while driving. The contact stated that the vehicle failed to exceed an undisclosed speed and later became undrivable. Additionally, the contact stated that the low oil pressure warning light was illuminated while there was sufficient oil in the engine. The contact received notification of NHTSA Campaign Number: 20V750000 (Engine), which the contact related to the failure. The vehicle was towed to the dealer, where the Knock Sensor Detection System (KSDS) software update was performed; however, the failure persisted. The dealer determined that the engine needed to be replaced. The dealer advised the contact to bring the vehicle back after the manufacturer had approved the request for the engine replacement. The vehicle was driven to the residence; however, the failure worsened while driving. The vehicle was not repaired; however, the recall was marked completed. The contact stated the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was notified of the failure. The failure mileage was approximately 125,330.