Bank 1 is the passenger side of your V6 in a Ford Ranger
Sensor 1 is somewhere close to the engine before the exhaust enters the catalytic converter
Oxygen sensor circuit slow response (Bank2, Sensor1). You have a fuel system problem or a bad computer or sensor.
They are located on the passenger side. Sensor1 is right past the exhaust manifold, and sensor 2 is after the cat.
motorcraft . com just shows ( 1 ) oxygen sensor for all available engines in a 1991 Ford Ranger
I'm not a mechanic / technician but on a 1988 Ford Ranger there might be ( 1 ) oxygen sensor ( upstream sensor )
It just has ( 1 ) oxygen sensor , before the catalytic converter ( upstream )
the o2 sensor is located on the exaust manifold
The O2 sensor after the catalytic converter.
16518- P0134 O2 Sensor Circ.,Bank1-Sensor1 No Activity Detected 16519- P0135 O2 Sensor Heater Circ.,Bank1-Sensor1 Malfunction
you can breath
The oxygen sensor reads the amount of oxygen in your exhaust to calibrate your air/fuel mixture. If it reads a higher voltage, the sensor is telling the pcm that you are running rich. Your sensor could be bad or need cleaning. Start with the inspection of the oxygen sensor for carbon deposits and the wire for any pinch or melting. Since it is a 97 you probably need to replace it anyways.
O2 Sensor Stuck Lean (Bank1 Sensor1).
p0132 O2 Oxygen Sensor Circuit High Voltage (Bank1, Sensor1). You have a bad oxygen sensor ( most likely ) and according to the code it is the forward most sensor on the bank 1 side of the vehicle. If you don't know which one that is have the parts store show you, it is the same sensor for both side bank 1, but different from sensor 2 usually.