P1121 Coolant Control Valve - Clear codes works fine for 3 minutes???

My guess is bad luck at the bone yard and you have to try again and get a refund for the defective one. Of course compared to how nice the car you got is, you're way more lucky than you are unlucky.

But please clarify... Do you just have the error code? Or do you have the symptom of the engine revving and unable to idle normally?

 

P1121 in a Prius has nothing to do with any throttle position sensor. Did you get that idea by googling for the code, or did some scan tool you were using actually say that?

You have to be especially careful looking for the meanings of P1 codes, because the entire P1 range is "manufacturer defined" codes that can mean completely different things in one make and another, even in one model and another.



If you have a P1 code like P1121 in a Prius and you want to know what it's about, the only really safe place to look is in a Prius repair manual:

Toyota Service Information and Where To Find It | PriusChat

The next safest is to make sure you limit your search to, say, PriusChat, where there will be a lot of threads with the right information. You will also find some threads giving wrong meanings (like the OP here), but you'll usually see them corrected in a later post.

P1121 in a Prius pertains to the coolant control valve. It's over on the left side of the engine compartment, closer to the transaxle and inverter (though it is definitely part of the engine cooling system, and nothing to do with the inverter).

 

Oh, apologies... When I did this job a couple years ago I had two codes, one for the throttle postion sensor and one for three way coolant valve. Guess I got the too numbers mixed up. Replacing the 3 way coolant valve is a fairly common repair for Gen2 Prius. This is the best price for an aftermarket version of that part. Way cheaper and likely zero difference than OEM: Heater Coolant Control Valve for Toyota Prius 2004-2009 16670-21010 New | eBay

 

I will attempt to give you some direction.

P1121-Coolant Flow Valve | 2004-2009 Prius

Prius P1121: Coolant Flow Control Valve Position Sensor Stuck - Earthling Automotive

 

Can you understand that P1121 is a manufacturer-defined code that some other manufacturer defines to mean "throttle body sensor" in some other car?

When Toyota uses P1121 in a Prius, they define it to mean the coolant control valve. Nothing at all to do with a throttle body.

 

What are you using to read the trouble codes?

I am guessing that your scan tool is not reading all the trouble codes that your car has. You need a capable scan tool like the Autel AP200. You buy it on Amazon or eBay for about $60 and load an app on your phone or tablet. Take a look at this tread: https://priuschat.com/index.php?posts/3290690

Edit: My guess is that you have a trouble code for the hybrid battery that you have not been able to read with the scan tool that you are using.

 

As stated by ChapmanF, trouble code P1121 has nothing to do with the throttle body! Look at some of the comments for the video you linked. They say the same thing. Because of your attitude, you will get no more help from me and a lot of others on this forum. You are on your own.

Edit: ChapmanF knows more about a Prius than 90% of the Toyota trained hybrid master mechanics in the USA. You owe him a big apology!

 

I have attached two Toyota documents that specifically address P1121.

While some of us can be caustic at times, the information you get is often accurate and certainly costs less than a diagnosis at a Toyota dealer.

Unfortunately the throttle body or one of the associated sensors could now be questionable. Often those incidental issues can be traced to a disconnected cable or hose.

Dorman hybrid batteries are not new, they are just a better set of used battery modules and a newly painted case.

 

I don't need an apology; it's all good as long as the right information ends up in the thread where later readers can find it.

I totally get the confusion that can be caused by codes in the manufacturer-defined range. P1121 definitely is a throttle body code, in some completely different other car. And the same code is the coolant control valve in a Prius, not the throttle body at all. This confuses people all the time, and clearly it confused 2CarPros, who then went and made a YouTube video that continues to confuse other people. If I'm a little bit ungentle in correcting that particular recurring mistake, that's why.

One of the comments on the video said, correctly, "The video title is misleading and will cause somebody to waste their time. P1121 has nothing to do with this video/procedure, it refers to the 3 way coolant control valve not the throttle body", and it got a reply from one Beach-Photo-Video saying "P1121 in all vehicles is a throttle position sensor." The "in all vehicles" part is a dead giveaway that Beach-Photo-Video does not understand there are both SAE-standard codes (like those in the P0 range) and manufacturer-defined codes (like all the P1s). Sometimes people even after being corrected will double down on their misconceptions.

I actually agree ... which is why in post #3 I supplied both the graphic showing you which code ranges are SAE standard and which are manufacturer-defined (so you would have that factual input, and not have to take my word for it), and also the link to the Toyota repair manual info, where you find the exact technical answer for what the P1121 is telling you.

 

What do you mean by this, because I'm sure you don't mean it was driven at 10 MPH for 100,000 miles?


Swapping the throttle body worked because you probably broke it when you opened the position sensor area and took a look inside. This component is non-serviceable and can not be adjusted in the field. It is set at the factory. So if this component does fail, then the only recourse is to replace the entire throttle body.

I don't really want to be drawn into the P1121 discussion, but from the point of view that misunderstanding the code's meaning has caused you to be drawn down a rabbit hole because you received an incorrect cookie-cutter text of what that code means. Would it make any difference to you if you were to learn that the correct cookie-cutter text straight from the Toyota Prius Repair Manual says this:



and the procedure for dealing with this is in the PDF linked in Post #16 above.

I have read your credentials and respect that, but I think that something is stopping you from just pausing and seeing just what information we are trying to convey.

I can assure you the man does not think you are a retard and nor do we. It was simply you repeated your statement that the code meant something incorrect after you were given the correct definition of what the code meant. Nothing more.

P3024 - means "Battery Block 14 Becomes Weak" and together with the P0A80 does mean that you have a hybrid vehicle (HV) battery issue. As pointed out in a previous post, a Dorman battery is not new but just a rework to remove poorly performing modules, replacing with less poorly performing modules, and maybe some charging and discharging to improve the capacity. They certainly can fail in a short time depending on a lot of factors.

With all due respect, I hope that helps.

 

The auto parts store code reader and whatever walmart sells won't work. They aren't programmed for Toyota hybrid specific codes...

You need to either spend $40 on Mini VCI plug that comes with cracked Toyota Techstream software to install on an old Windows laptop or buy one of these OBD2 code readers so you can use Car Scanner (Elm) app and Dr. Prius App on your phone: Panlong OBD2 Scanner Bluetooth OBDII Diagnostic Tool Car Code Reader Turn Off... | eBay

That second one is especially valuable to have in your glove box and may mean the difference between quickly getting to your destination after a 30 second delay or never getting there on time because you had to wait for a tow truck.

PS: Please read all of the post in your thread... Based on your replies, it's clear you haven't read the entire thread.