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2016 Ford Focus p0420

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Hello Scotty. I have a 2016 focus with 60k miles on it that keeps getting a p0420 code. I took it for a diag and after 2 days they told me it was one of the O2 sensors. I replaced it and the light keeps coming back on and off. Is the other sensor bad or is my cat converter really bad at 60k miles. Please note as well I just replaced the Evan purge control valve if that has anything to do with it.

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Which 02 sensor (before or after the cat) did you replace? And did you replace the sensor with an OEM one?

See below:

https://www.obd-codes.com/p0420

Along with video on diagnosing the cat:

https://m.youtube.com/watch?v=9VZ5K8n5jj0

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