On the 4.0 liter OHV - V6 - I believe there are ( 3 ) on a 1996 Ford Explorer
2 that are used for the air / fuel mixture that are before the catalytic converters
( upstream ) and 1 after the catalytic converters ( downstream ) that is used as a
catalyst monitor
4 ======================================================= The above answer is correct if you have the 5.0 liter V8 engine in your 1996 Ford Explorer , but if you have the 4.0 liter EFI , V6 engine ( VIN " X " ) there are ( 3 oxygen sensors )
Dealership or any auto part store.
The oxygen sensors located before ( upstream ) of the catalytic converters are used to " sense " the amount of oxygen in the exhaust to adjust the air / fuel ratio for the engine
I have a 1996 cadillac deville concours, an it has 4 oxygen sensors
The 5.0 liter V8 has ( 4 ) oxygen sensors The 4.0 liter EFI ( which is an over head valve / pushrod design ) has ( 3 ) oxygen sensors Note: The 2 upstream oxygen sensors are used for adjusting the air / fuel ratio of the engine , the other oxygen sensor (s) are called catalyst monitors and monitor the performance of the catalytic converter(s)
All oxygen sensors are threaded into the exhaust system.
The oxygen sensors on a 1996 Chrysler Town and Country are screwed into the exhaust system behind the engine.
My Chilton repair manual engine wiring schematic, for the 1996 Ford Explorer with a 4.0 L OHV engine shows 3 . Two are upstream (before the catalytic convertor) and one downstream (after the catalytic convertor - which is an oxygen sensor but is used to monitor the efficiency of the catalytic convertor)
they are part of the hub assembly
3
two
two