97 Montero with 163K, 3.5L SOHC

A few weeks ago the engine got a little to hot(Tucson AZ). couple days after that i got a check engine light. it took me a few more days to get the stuff I need to read the code. when I did i get a Code P1400. The OBD thingy says that means there is something wrong with the intake manifold sensor. I am new to OBD readers and don't know if there is a central databace somewhere?

my question is.. well questions are.

is that correct? P1400 = intake manifold sensor?
where is the intake manifold sensor?

if the code is correct, is this common? if so what is the common fix?

thanks