2009 Prius code P1121

mazenkordi · Jun 9, 2017

JC91006 said: ↑

Try bleeding the system yourself, it's a very simple process. Look at this video

After you bleed the system, disconnect the 12v battery for a minute to clear the code. See if it comes back.
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bisco · Jun 9, 2017

i guess that could be the problem...

lucasanderson298999 · Feb 1, 2018

James Pendorf said: ↑

Hello, this is my first post. Apologies if there is already a thread about this, but I haven't seen it at time of posting this. I have had a check engine light on my prius for over a year, our mechanic says that it is electrical and don't worry about it. We now have to smog the prius in CA this year and it won't pass with the Check Engine light on. Our mechanic tried to fix it and couldn't. I took it to Toyota in Hollywood and they replaced the Coolant Control Valve under warranty, but they are still getting the code and the Check Engine light is still on. After further diagnosing the prius, they suggested that I replace the ECU for $1170.00 thought they can't guarantee this is going to fix the issue. If it doesn't fix the issue they suggest that they replace the wiring harness for almost $7500. Has anyone experienced this problem and found a solution? I need to get it smog checked before the end of August, so time is not on our side. Thanks for your time.
Click to expand...

hey I have this same code, how did you ask the dealership to fix under the california emissions warranty? what do they ask for? I went to another dealership and they said it's not under that... Please help if you can. Thank you

2009 Prius code P1121

mazenkordi New Member

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2009 Prius code P1121

mazenkordi New Member

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lucasanderson298999 Junior Member