Hi,
There should be a difference between the inlet and outlet of about 30 to 100 degrees F. If it is the same, the converter isn't working properly.
Take a look at this link:
https://www.2carpros.com/articles/how-to-test-a-catalytic-converter
The difference at the top is odd. It could be due to air restrictions to cool it based on its physical location.
The P0420 indicates the catalytic converter is operating below the threshold. So, you may simply have a faulty catalytic converter. Did the other two codes return? By any chance, is there an exhaust leak before the catalytic converter?
Let me know. Also, review the aforementioned link and let me know your thoughts.
Take care,
joe
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Thursday, August 17th, 2023 AT 8:47 PM