Based on the live data, the engine is running very rich (too much fuel). As far as your question is concerned, code P0420 usually indicates the catalytic converter is bad. That isn't always the case, but in many cases it is.
As far as the O2 sensor is concerned, the scan tool indicates you are getting a signal voltage from it while the engine is running. And the sensor is within range.
So, here is what I need you to do. We need to determine if the converter is bad. If you look through this link, it explains what to check. If you have an infrared thermometer, you can check the converter temperature at the inlet and at the outlet to see if there is a variation. The difference should be between 30- and 100-degrees difference between the front and rear. The rear will should be hotter.
If the temperature is the same at both ends or the rear is cooler, replace the converter.
Let me know what you find.
Wednesday, February 1st, 2023 AT 7:42 PM