The contact owns a 2021 Kia Soul. The contact stated while driving at an undisclosed speed, the contact heard an abnormal sound coming from the engine compartment. There was no warning light illuminated. The contact received notification of NHTSA Campaign Number: 25V099000 (Engine and Engine Cooling); however, the part to do the repair was unavailable. The vehicle was taken to the dealer, where it was diagnosed that the piston oil rings had failed and needed to be replaced. The dealer confirmed that parts were not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was not made aware of the failure. The approximate failure mileage was 41,000. Parts distribution disconnect.