Bank 1 O2 sensor?

Hello,

The right side is the bank 1. The one before the catalytic converter is the sensor 1 (upstream) and the one after the catalytic converter is the sensor 2 (down stream).
The upstream sensor is located on the exhaust manifold and down stream sensor is in the exhaust pipe after the catalytic converter.

https://www.2carpros.com/articles/how-an-oxygen-sensor-works
https://www.2carpros.com/articles/how-to-test-an-oxygen-sensor-02-sensor
https://www.2carpros.com/articles/how-to-replace-an-oxygen-sensor

I have attached diagrams for your reference.

Please let me know of any questions.
Thank you.