There are 2 heated exhaust gas oxygen sensors , 1 screwed into the outlet on each exhaust manifold on a 1993 Ford Ranger 4.0 L .
I was looking in my Chilton book at the engine wiring schematic for a 1993 Ford Ranger 2.3 liter 4 cylinder and I only see ( 1 ) heated oxygen sensor
2.3
motorcraft . com just shows ( 1 ) oxygen sensor for all available engines in a 1991 Ford Ranger
I'm not a mechanic / technician but on a 1988 Ford Ranger there might be ( 1 ) oxygen sensor ( upstream sensor )
I believe there is an oxygen sensor in each of the exhaust manifold outlets ( 2 ) on a 1993 Ford Ranger 4.0 liter
should be by balancer
The O2 sensor after the catalytic converter.
the o2 sensor is located on the exaust manifold
you can breath
M14x1.5
It doesn't have a knock sensor on the 4.0 L OHV in a 1993 Ranger ( my 1995 Ford Explorer 4.0 L OHV engine doesn't have a knock sensor either )
It just has ( 1 ) oxygen sensor , before the catalytic converter ( upstream )