Question

OBD reader read: O2 sensor heater, Circuit bank 1, sensor 2. Does this indicate which O2 sensor needs replaced?

Answer 1

Hi there,

Yes, it's telling you the sensor on bank 1 after the converter needs to be replaced. Now in this case you may only have 3 O2 sensors on the car, so it would be the one after the converter. Anytime it says sensor 2 it is after the converter.