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They are screwed into the exhaust on the rear of the engine.
Yes.
oneone
Two.
Yes, you unplug and unscrew them.
A 2002 Chrysler Town and Country has two oxygen sensors.
Assuming you mean O2 sensors, the 2004 Chevrolet Malibu with the 2.2L engine has two O2 sensors, one upstream (before the cat) and one down stream (after the cat).
YES
4
Oxygen sensors are screwed into the exhaust on both sides of the catalytic converter.
Four. Two forward of the cat converter and two aft.
the upstream O2 sensors, are located on the top of the exhaust manifolds. they are sitting right there in the open where you can see them.