Check engine light P1121 code. Still get warm air. What's...

Q: Check engine light P1121 code. Still get warm air. What's the est. to see if the valve needs replacing or if its a faulty wire?

asked by on October 06, 2017

The check engine light is on. Sometimes it comes and goes but its usually on. The code is P1121. I'm wondering if the coolant valve needs replacing or if a faulty wire is causing the check engine light. I can still get cold air and warm air (maybe not hot, but definitely warm). I'd like to request a coolant valve replacement but I am wondering what happens if the part turns out to be fine and its a faulty wire that needs fixing instead. Thanks for your help!

Hi Willow. Thanks for contacting us tonight. The second generation Prius, model years 2004-2009, uses a 3-way valve to control coolant flow between the engine, the hot coolant storage tank (thermos), and the heater core - which is what causes hot air to blow from a heater. If something goes wrong with this valve, the “check engine” light comes on. The valve is prone to sticking, and Toyota actually issued a service bulletin on the replacement of the coolant flow valve. I have forwarded your inquiry to our sales and service department so they can look up the right part that needs to be replaced and verify that one of our mobile mechanics in your area can complete this service for you. I would strongly recommend having the electrical harness replaced at the same time, as it’s common for the harness to fail overtime.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

How to check which (valve/head)gasket is not working& what is the price to fix head gasket ?

The problems you describe (leaking radiator, overheating) often lead to a "blown" or leaking head gasket. For your vehicle, there is only 1 head gasket, which would need to be replaced. This is in addition to any failure of the...

Why does my oil light comes on when i break. My oil level is full.

Claimed by Kevin Gainer

My engine management light is flickering on when I accelerate and the car is jerking

Hey there. This may be an indication of a failing or dirty mass air flow sensor. This is a unit that monitors air intake as it is mixed with fuel prior to being injected into the engine. When this is...

Related articles

The Top 5 Selling Cars in California in 2012
California California natives are notably environmentally conscious, and this often shows in their choices of vehicles as well. While trucks rarely make it to the top spots, hybrid vehicles are frequently on the list. Though previous years have seen the...
The Best Used Cars to Buy If You're an Archeologist
If If you are an archaeologist, you need a vehicle that will take you off the beaten path. After all, that’s where you spend a good deal of your time. And that means that you will need, ideally, an SUV...
The Best Used Cars to Buy for Short Commutes
If If you’re lucky enough to have a short commute to work, then you need to consider different factors when buying a used car than someone with a lengthier drive (or more time stuck in traffic). Chances are good that...