Hello! Welcome to the site! Thanks for coming! I'm Ron Z. I'm here to provide as much info and insight as I can, to best answer your question.
On this vehicle, Bank2 Sensor1 is on the side of the engine
closest to the front of the vehicle, mounted to the exhaust
manifold, before the converter. So, you are looking for "Upstream Left". Also, on this vehicle, this is an A/F (Air/Fuel Ratio) Sensor, not just an "Oxygen Sensor" (almost the same, but the A/F Sensor is "smarter" to handle extra Toyota demands on it). So make sure the sensor you get meets Toyota A/F Sensor specs and is a "direct fit". A "universal" oxygen sensor will not solve the problem here!
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