The contact owns a 2016 Kia Optima. The contact stated while driving at various speeds on several occasions, the vehicle was shuddering with a knocking sound coming from the engine compartment. The vehicle was taken to a dealer where it was diagnosed and determined that the engine needed to be replaced. The vehicle was repaired; however, the failure persisted. The contact stated that a message "Do not drive - Tow to Dealer" was displayed, and the check engine warning light was illuminated. The vehicle was towed to the dealer where it was diagnosed that a loosened turbo hose needed to be tightened. The vehicle was repaired but the failure persisted. The vehicle was towed to another dealer where it was diagnosed that the high-pressure fuel pump needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 112,000.

- Mechanicsville, VA, USA

The contact owns a 2016 Kia Optima. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power with an unknown warning light illuminated. Additionally, the vehicle occasionally overheated while the coolant level was full. The dealer was made aware of the failure; however, the vehicle was not diagnosed nor repaired. The contact related the failure to a faulty low-pressure fuel pump. The manufacturer was made aware of the failure. The failure mileage was approximately 47,000.

- Redmond, WA, USA