Solved 2005 Toyota Prius Check Engine Light On Mechanic Says Code Is P01121 Toyota

Chosen Solution

Mechanic says this code, P01121, means “coolant flow control valve.” I have not fixed this. Does anyone know about a reader for the OBDII port (mechanic charged a lot for reading the code)know how to interpret these codesknow if “coolant flow control valve” is serious? the car works fine, but the check engine light is almost always illuminated

Try this it may help https://www.youtube.com/watch?v=_JHNNBbh…