I got the P1121 Error Code on my 2009 Prius while in Texas for a trip recently and have been calling my normal places to get this fixed and have been quoted much higher then I anticipated that I would need to pay for this. Looking online paying approx. $300 is about what I was thinking this would cost and I have been quoted much higher at about $580. I am going to drive down to Toyota and see what they say later this week but I wanted to see if anybody in the area had a good recommended mechanic that won't overcharge me. I am in Rogers area more specifically.
I'll be glad to help you. I can fix it in your driveway for $430 plus tax. That includes parts, labor, and travel. I'll also check your maintenance items and let you know if I find something that needs attention. Just give me a call if you want to get together.