The IAT sensor is built into the mass air flow sensor. You can find it in the air duct between the engine inlet and air filter.
You can find a 1996 Nissan Pathfinder knock sensor picture in most auto repair manuals. Most Nissan dealerships repair centers will provide you with a picture of the sensor.
It is very easy to find. It is at cat. inlet. you can see it from the top when you open the hood.
the temp sensor is on the drivers side, back of the engine near the inlet manifold, hope this helps a little, took me hours to find it :)
open your owner manual and you will find the answer.
The engine size is needed to answer your question.
I believe you'll find it at the point where the exhaust pipe fits into the inlet of the catalytic converter.
on 20v engines behind the timing cover on the inlet cam l/h side of the engine its got a plug
You can find the village on the east side of the inlet, and approach it in a boat.
Downstream ... This is after the Catalyst Converter.
It is on the throttle body, opposite of where the cables attach.
Start at the exhaust manifold and follow the exhaust pipe toward the rear of the vehicle and you will find the O2 sensor.