the o2 sensor is located on the exaust manifold
If it's like a 1991 Ford Explorer ( with the 4.0 liter V6 engine ) It has ( 1 ) oxygen sensor
motorcraft . com just shows ( 1 ) oxygen sensor for all available engines in a 1991 Ford Ranger
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
no
The sensor located on the left side of the oil pan near the front of a 1991 Ford Ranger with a 3.0-liter engine is typically the oil pressure sensor. Yes, this engine also has a crankshaft position sensor, which is crucial for engine timing and operation. The crank sensor is usually located near the crankshaft or at the rear of the engine block.
In a 1991 Ford Ranger : The heads on the 2.9 , 3.0 and 4.0 liter V6 engines are cast iron
145hp
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
yes it has both. at least in my 1991 ford ranger does
Look by the balancer.
One
It has ( one oxygen sensor ) on the 1991 and 1992 Ford Explorers