Toyota Prius V loud knocking and rumbling while parked, potential blown head gasket causing spark plug damage on Toyota Prius V

Some Toyota Prius V owners report experiencing loud knocking and rumbling noises while parked, which may indicate a serious issue such as a blown head gasket. This problem is commonly associated with certain Prius models and can lead to engine overheating and other critical issues. Owners have noted that driving with a blown head gasket can result in coolant depletion, engine overheating, catalyst damage, and the risk of steam removing oil from the cylinder walls. Symptoms reported include coolant leaks, overheating, white smoke from the exhaust, and mixing of coolant and oil. It is crucial for owners to address a suspected blown head gasket promptly to prevent further engine damage. If these symptoms occur, it is highly recommended that owners have their Toyota Prius V inspected by a qualified mechanic for accurate diagnosis and necessary repairs.