yes
There are two. One immediatly before the catalytic converter and one after.
there should be 4 two are pre cat and two are post cat
Two
Two
TwoTwo
There are two oxygen sensors screwed into the exhaust on the rear of the engine.
Two.Two.
Two, one upper one lower.
there are 2 pre and two after
There are two screwed into the exhaust on the rear of the engine .
Bank 1 is on the passenger side. Bank 2 is on the drivers side. The O2 sensors are screwed into the exhaust system. Follow the exhaust manifold rearward and you will find the O2 sensors.
There are two O2 sensors for the 01 QX4. One in front of the catalytic converter and other is behind the converter.