Hi and thanks for using 2CarPros. Com.
The temperatures you listed do not sound out of the ordinary. If the P0420 is the only code, chances are the catalytic converter is bad. If there was an issue with an O2 sensor or the air fuel sensor, an additional code would be set.
Check to make sure there are no exhaust leaks, which can lead to this code.
Let me know if there are any other codes.
Joe
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Sunday, November 11th, 2018 AT 6:39 PM