The case
Engine replaced at 366 miles — then the hybrid transmission was replaced too
Our client leased a 2024 Kia Niro hybrid. Ten days after delivery, with 366 miles on it, it was back at the dealer with a loud rattle and vibration from the engine.
The dealer found a cylinder misfire and, using a borescope, damage inside the cylinder block. The engine's long block was replaced, then the catalytic manifold. Weeks later an oxygen sensor failed. At about 14,400 miles, a flashing hybrid warning light led to a transmission-related fault, and the transmission was replaced. The hybrid system warning came back again later, and the vehicle was towed in.
