Yaris 2005 P0135 DTC code

[TurnItRound]

I have a Yaris 2005 1300cc with a P0135 error. Scan code reveals 'O2 sensor Bank 1 Sensor 1 heater circuit malfunction'. Can anyone please confirm that this is the Lambda sensor above the catalytic converter (the one with the short lead). Anyone got recommendations of a good source for a new one in the UK please.

[CTScott]

That is correct that is is the one before the cat.