Top left of the catalytic converter (directly in front of the engine (by the bumper), under the heat shield).
The oxygen sensor's are heated. so I guess that's where you are comming up with the word heated. Bank means- what side of the engine that the oxygen sensor is on. Bank 1 or bank 2
There is a failure in the oxygen sensor heater.
Heated oxygen sensor heater circuit malfunction (bank 1, sensor 1): Open or short in heated oxygen sensor heater circuit Heated oxygen sensor heater malfunction (Haynes Repair Manual)
The HO2S (Heated Oxygen Sensor) bank 1 is between the manifolds and the Cadillac Converter. Manifold Exhaust (T) > "HO2S Sensor" > Cadillac Converter > muffler
Bank 1 is the part of the exhaust stream that includes cylinder #1. Sensor 2 is after the catalytic converter.
P1132Lack Of Upstream Heated Oxygen Sensor (HO 2 S 11) Switch, Sensor Indicates Rich (Bank#1)P1152Lack Of Upstream Heated Oxygen Sensor (HO 2 S 21) Switch, Sensor Indicates Rich (Bank #2)
Lack of upstream heated oxygen sensor switch - sensor indicates rich - bank no. 2
bank 2 is the drivers side of the engine sensor 2 is after the exhaust has passed through the catalytic converter ( downstream )
Bank 2 sensor 2 refers to the oxygen sensor on the passenger side of the exhaust system and after the catalytic converter. heater circuit is the oxygen sensor or the wiring going to it, it is what is called a heated oxygen sensor. Google image search oxygen sensor and that is what it looks like, and they can be a bear to get out.
Bank 2 sensor 1 would be the first sensor located on the passenger side exhaust pipe closest to the engine.
if it is a V8 bank 2 is on the right (passenger side). sensor 1 is before the catalytic converter (sensor 2 is after)
It's underneath the vehicle in the exhaust pipe after the cat convertor.