The contact owns a 2020 Kia Soul. The contact received notification of NHTSA Campaign Number: 21V259000 (Engine); however, the dealer informed the contact that the recall repair could not be performed because the test used to check the piston rings was faulty. The vehicle was remained at the dealer. The contact stated that the manufacturer exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.