code 5 o2 sensor
code 3 water thermo sensor?

my question is about my second code is this my thermostat or is something diffrent??

 

The water thermo switch is a 2 (might be a single prong.. but you will see it) prong switch on the upper neck just off the water pump housing. Nothing to do with the thermostat, but might as well test, or replace it while your in the area.

-Robert