I can't find my Intake air temperature sensor location to replace it

Then why does it give me that code? What do I do from here?

don't believe your 91 has an air charge temp sensor(IAT). I do have one on my 98 Camry 2.2L and it's mounted in the upper half of the air filter box in a rubber grommet. don't know why you're getting that code? possible air leak somewhere in that box/tube,hose split/disconnected, MAF sensor?

Thanks. I found out that the IAT is built into the mass air flow so i think that is my next option.