What is the Mileage of your
What is the Mileage of your used prius? it already had head gasket failure before, usually the cat also failed when head gasket fail. I am wondering if it is caused by the coolant being sucked back to the EGR valve and caused this problem. I do not understand how the motor failed if the valve is not clogged, probably just failed coils and you got lemon motors. What i understand, that one is brushless stepping motor, not like doors actuators that fail very often in many Toyota with automatic lock and unlock like in Sienna.