The upstream (Sensor 1) o2 sensor is in the exhaust manifold. If you take a look at pic 1, I highlighted where to look. Picture 2 just indicates that number 10 in the picture is bank 1 sensor 1.
The last pic shows a view from the back of the engine (against the firewall). I circled the sensor.
If you plan to replace it, here is a link you may find helpful:
Let me know if this helps or if you have other questions.
See pics below.
Images (Click to enlarge)
Thursday, December 15th, 2022 AT 9:15 PM