I'm not a mechanic / technician but on a 1988 Ford Ranger there might be
( 1 ) oxygen sensor ( upstream sensor )
That Vehicle has 2 oxygen sensors.
how many o2 sensors on a ford e350 van 2003
My 1995 Ford Explorer with the 4.0 L OHV engine has 2 , so I'm assuming your 1995 Ford Ranger 3.0 L would also have 2
If it's like a 1991 Ford Explorer ( with the 4.0 liter V6 engine ) It has ( 1 ) oxygen sensor
The 1992 Ford Taurus has two oxygen (O2) sensors. Both O2 sensors are located upstream of the catalytic converter with one on each exhaust bank.
All O2 sensors are threaded into the exhaust system at various points.
There should be 2 (upstream) O2 sensors (one for each bank of cylinders) before the catalytic converter and only one (downstream) O2 sensor after the catalytic converter. All 3 are threaded into the exhaust system.
i have a 2001 f250 v10 only have 2 o2 sensors
Looking at the 1991 Ford Ranger - 4.0 L V6 - engine wiring schematic in my Chilton repair manual , it shows ( ONE ) heated exhaust gas oxygen sensor
there are 4 o2 sensors
On my 1988, O2 sensor is threaded into side of exhaust pipe underneath near transmission. When I changed it, it was difficult to remove. I had to keep heating the exhaust pipe with a torch to get it out.
there are 2