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It is the intake air temperature sensor , and it,s located in the air intake boot.
The most likely cause is an intake manifold gasket leak (that is if all the hoses and water pump have been ruled out)
It is under the intake manifold. Darn hard to get to and expensive to change.
The Villager has an upper and lower intake manifold. It is at the top of the engine with the throttle body attached to it.
Intake Air Temperature Sensor. Located in the plastic air intake tube beside the battery.
In a 1998 Mercury Villager, the mass air flow sensor is located in the air intake tube. The air intake tube goes from the air box to the intake.
The knock sensor is under the intake manifold, which has to be removed. This should be left to an experienced mechanic.
Sitting right on top of the engine.
It is under the intake manifold.
On top of the engine. Everything between the valve covers is considered the intake manifold.
Top of the throttle body.
What engine? and ensure it is a bad gasket, not an intake plentum.