Yaris - Engine management light -02 sensor heater circuit (bank 1, sensor 2)

[bledd]

How do I find out if this is the front or rear oxygen sensor?

1L Petrol Yaris 2002

 

[andythelandy]

Every car I've ever worked on sensor 2 is the post cat.

 

[unrealrocks]

A quick Google seems to suggest Bank 1 Sensor 2 is the one further down the exhaust, after the cat.