Its located on passenger side of truck. Just behind the front right wheel, crawl under truck and look up. Its on exhaust pipe/manifold just in front of cat. converter.
An auto xray scanner can determine if a O2 sensor is bad.
It has ( one oxygen sensor ) on the 1991 and 1992 Ford Explorers
Just downstream after the exhaust manifold
motorcraft . com just shows ( 1 ) oxygen sensor for all available engines in a 1991 Ford Ranger
they are located on the exhaust manifolds
on the side of the block not the one buy the oil filter
engine light comes on and off. when light is on it hesitates and transmission slips. what could cause that on a 93 F150
The oxygen sensor is located on your lower exaust pipe just before the cat underneath the car
The 1991 Cadillac Deville oxygen sensors are located on the firewall and the air cleaner housing. The firewall oxygen sensor will be on the drivers side. The air cleaner oxygen sensor will be on the back of the air cleaner housing.
Usually in the exhaust pipes coming off the manifolds
drivers side of engine , downstream from catalytic converter
Near the starter on the exhaust header. If it is 1990 it will be fun to break the rusty sensor out of the truck. good luck