It is right on top of the Catalytic Converter.
The upstream O2 sensor is mounted in the ehxaust manifold The downstream O2 sensor is mounted in the exhaust pipe after the catalytic converter
don't have the foggiest
I'm not a mechanic / technician but on a 1988 Ford Ranger there might be ( 1 ) oxygen sensor ( upstream sensor )
it is the rear sensor bank 1 (the one after the converter)
usually bank 1 is the bank with # 1 cylinder in it and sensor # 1 is the front o2 sensor(usually in the manifold). You will need a O2 sensor socket or a 22mm wrench or deep socket.
The O2 sensor after the catalytic converter.
the o2 sensor is located on the exaust manifold
I had the same problem on my 98 Mazda 626 and the O2 sensor was faulty.....
Just reset your computer after replacing the O2 sensor.
On a 1998 Ford Ranger : Assuming you have either the 3.0 or the 4.0 liter V6 engine : Bank 1 is the passenger side of the engine Sensor 1 ( upstream sensor ) would be close to the engine before the exhaust enters the catalytic converter ( it might even be in the outlet of the exhaust manifold )
"bank one" is misleading on a four cylinder engine, since there is only one bank to begin with. Bank 1, sensor 1 is the upstream O2 sensor screwed into the exaust system before the catalytic converter. Bank 1 sensor 2 is screwd into the exaust system downstream of the catalytic converter.
Depends on what type of vehicle you have.