Prius Overheat - P0117??

Hello group. Bought an 08 Prius w 144k at auction, and has bad hybrid battery - got that covered. It had a p0117 code as well, and I noticed that it got up to about 230F on the 1 mile drive home. I cleared the code with handheld. When I plugged in techstream and ran around the block, I had a code for P1121 pending - research tells me that P1121 is not related to engine cooling. When previous owner took car to dealer, it was for P0a80 and the P1121/p116. My question is - will the P0117 temp sensor cause the temp to spike?? or could it just be bad reading. My thoughts is to replace the heater switch valve and temp sensor - the one next to hybrid coolant reservoir. Any other suggestions?

 

thanks for the reply. I thought it was a separate loop. I have ordered a replacement, as it needs it either way.