When this happens, the connecting rod bearings are starved of oil and fail.
Metal debris inside the engines – left over from the manufacturing process – plugs up internal lubrication holes. The Theta II powerplants are well-known for unexpected, catastrophic failure. These units are referred to as the “Theta II” family of engines. The majority of the problems are with the 2.4L four-cylinder and the turbocharged 2.0L. There were four different engine options offered in the 2015 Hyundai Sonata.
