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2016 Ford Focus p0420


Topic starter

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.

1 Answer

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

See below:

Along with video on diagnosing the cat: