Hi,
The code, P0420, is related to a catalytic converter not operating properly. Is this the only code you have? I ask because it could be related to the heated oxygen sensor as well. However, if there is no code for the sensor, chances are the converter needs replaced.
Take a look at the pic below. It provides a basic inspection of the converter. Check through it and perform any of the steps you can and let me know the results.
Take care,
Joe
See pic below.
Image (Click to make bigger)
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Monday, November 29th, 2021 AT 6:35 PM