Bank 2 Sensor 2 is passanger side after cat.
Usually bank 2 sensor 1 & 2 are right after the converter in the exhaust pipe.
That is passenger side after the catalyst.
Bank 2 is on the passenger side of the vehicle. Sensor 2 is down stream ( behind ) the catalytic converter. Second sensor from the manifold. May have 4 sensors.
The rear cylinders are 1-3-5 so that is bank 1. Front cylinders are 2-4-6 so that is bank 2. Follow the exhaust pipe from bank 2 and you will find the O2 sensor.
the bank 2 is on the driver side i got this info from an Isuzu mechanic
Oxygen sensor bank 2 (pass side) sensor 2 ( after cat) circuit
Bank # 1 is the passenger side of the engine Bank # 1 , SENSOR # 1 , is close to the engine in the exhaust Bank # 1 , SENSOR # 2 , is in the exhaust after the catalytic converter ( downstream )
Bank 2 is the drivers side of the engine on your 2004 Ford F-150 Sensor 1 would be in the exhaust before the catalytic converter ( upstream ) Sensor 2 would be in the exhaust after the catalytic converter ( downstream )
P0157 02 Sensor Circuit Low Voltage (Bank 2 Sensor 2)
Bank 1 sensor 1 is upstream bank 1 sensor 2 is downstream
Drivers side post cat converter. If there is are misfire codes highly recomend replacing the plugs but at this point the cats may be damged anyways.