Toyota Prius leaking head gaskets causing exhaust in cooling system and coolant in cylinders, extensive repair needed on Toyota Prius

Some Toyota Prius owners report experiencing significant issues related to head gasket failure, such as exhaust gases entering the cooling system and coolant leaking into the cylinders. These problems can manifest as coolant leaking into the combustion chamber, which is expelled as steam through the exhaust, and the presence of white smoke from the exhaust due to coolant intrusion. Additionally, some owners note misfiring of cylinders, particularly cylinder #2, as coolant interferes with the combustion process. Repairing a leaking head gasket can be complex and often requires thorough diagnosis and repair work, including identifying symptoms like poor engine performance or complete engine failure. Owners may also need to address external coolant and oil leaks associated with head gasket failure. To prevent these issues, proper maintenance, such as regular cleaning of the EGR valve and EGR cooler, is recommended. It is crucial for owners to address head gasket problems promptly to avoid further engine damage and to consult a qualified mechanic for inspection and repairs if they suspect issues.