On June 1, 2022, the vehicle was towed into the dealership. Customer complained it stopped while running and wouldn't start. Initial engine Dx was completed. The battery and starter were replaced. Upon replacing both, the engine started, but was making a "clicking" sound. On June 20, 2022, another engine Dx was performed. Dx revealed DTC P1326 - Knock Signal Range/Performance and DTC B1688 - Cluster Ionizer Fault. Engine was under an extended warranty. Given known engine issues with these vehicles, Dealership planned to request Hyundai replace the customer's engine. Customer was the original owner and routinely serviced vehicle at the dealership. The vehicle was moved to the back of the storage lot. Several minutes after parking same, they observed smoke coming from the engine compartment. Three fire extinguishers were used in an effort to suppress the engine fire. The Fire Dept. was ultimately called to extinguish the blaze.