Its located in the exhaust pipe on rear of engine.
No.
It is called an oxygen sensor socket.
It is on the back exhaust manifold.
It has both an up and a down stream oxygen sensor.
A 2001 Dodge Caravan doesn't have a knock sensor.
Top of the rear exhaust manifold.
There is one on each side of the catalytic converter.
There are two. One before and one after the catalytic converter.
There is a problem with the downstream oxygen sensor. I would replace it.
It is the sensor in the outlet of the catalytic converter.
It is screwed into the exhaust manifold behind the engine.
A 1999 Dodge Caravan does not have a mass airflow sensor.