What does a coolant control valve do Prius?

The coolant storage tank helps reduce emissions and increase fuel economy (more on how below). But because the Prius has this storage tank, it needs something called a coolant flow control valve (aka water control valve) to regulate the flow of coolant in and out of the storage tank.

What is P1121?

If you have a check engine light and code P1121, your coolant flow valve needs to be replaced.

What is a coolant flow control valve?

Rotary valve is used for shutting off the coolant flow, switching over coolant circuits and regulating the coolant flow.

How do I fix code P1121?

The fix is replacing the valve. It’s mounted along the driver’s side frame of the engine compartment, near the radiator, and can be removed by elevating the inverter and pulling the valve out from the top.

What is a water control valve in a car?

The heater control valve (or hot water valve) opens to allow hot coolant from your engine to flow through the heater core. Air from either inside or outside the vehicle then passes through the hot heater core, which warms the air before it enters the passenger compartment of your vehicle.

How do I fix code P0223?

What repairs can fix the P0223 code?

  1. Replacing the throttle position sensor.
  2. Replacing the Engine Control Module.
  3. Plugging in, repairing, or replacing wiring that is associated with the throttle position sensor.
  4. Repairing or replacing the throttle body.
  5. Realigning the throttle position sensor.

How do I fix code p1121?

How do I check the coolant level on a 2009 Prius?

You can get a quick check of the level by looking at the markings on the side of the reservoir. Should the liquid hit the “full” marking line, you’re all set. If it falls short of that, remove the radiator cap and add in the coolant or a 50/50 mix of coolant/water.