There are probably some Youtube videos that show O2 sensor replacements. Your car has 2 sensors, before and after the cat.
The p0133 is for the front O2 sensor.
The plug for both sensors are on top of the transmission and close to the firewall. If you have a turbo, it will be difficult to see them. The grey plug is for the rear sensor.
Best bet, get under the car, passenger side and look up at the sensor. I had good luck with a 7/8" attachment designed for sensor removal.
This FCP video is a bit quick, just scroll down to seee the video box:
https://www.fcpeuro.com/products/volvo-oxygen-sensor-front-850-c70-s70-v70-15097
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