Hello everyone. I am facing a strange problem. My prius 2014 would pop up Engine sign with P261C in scan in a hot weather about 40°C. However in morning and in evening it never happens. I have changed 2 to 3 water bodies and the running is also pretty fine...Secondly I have noticed, it happens when I switch on air conditioning. Any exact diagnosis will be of a great help I deed.
I assume by "water bodies" you mean what I would call water pumps? Where have you obtained the water pumps you have installed? Do you have access to a scan tool that can show you the target and actual water pump RPM while driving? Do you have access to an oscilloscope?
