The contact owns a 2014 Hyundai Sonata. The contact stated while driving at an undisclosed speed, there was an abnormal knocking sound coming from the engine compartment. The contact stated that the sound was persistent. The vehicle was driven to a local restaurant parking lot. The contact stated that the vehicle had stalled several times. The contact was afraid to drive the vehicle because of the failure. The vehicle was towed to the residence. The dealer was made aware of the failure and advised the contact to have the vehicle towed to the dealer. The vehicle was then towed to the dealer; however, the failure was not duplicated. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The contact stated that in November 2024, the vehicle was taken to the dealer and several unknown recall repairs were performed. The contact stated that the failure began shortly after the recall repairs were performed. The manufacturer was made aware of the failure and a case was filed. The failure mileage was approximately 158,000.