I'm taking a guess here that it possibly has 1 - the 1991 and 1992 Ford Explorers with the 4.0 L OHV engine only have 1 oxygen sensor
I'm not a mechanic / technician but on a 1988 Ford Ranger there might be ( 1 ) oxygen sensor ( upstream sensor )
My 1995 Ford Explorer with 4.0 L OHV has 2 oxygen sensors (Helpfull)
That Vehicle has 2 oxygen sensors.
Check
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 .
According to the engine wiring schematic in my Chilton book : For a 1999 Ford Ranger , 4.0 liter EFI , V6 engine : ( there are 3 oxygen sensors )
you can breath
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
there should be 3/1 on the left header then 2 going back
A little more information please ( what year of Ford Ranger , what size is the engine ) As far as I know there could be as many as four oxygen sensors or as little as one depending on the year and engine size
where are the oxygen sensors on a 2004 ford escape with a 3.0 engine
i need help with the temp.gage in a 1988 ford ranger