Code P0420

Hello, I'm Danny.

That code is for your bank 1 catalytic converter being deficient or performing below threshold. Here are a few tutorials for you to view about function, testing, and replacement of catalytic converters:

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

https://www.2carpros.com/articles/how-to-test-a-catalytic-converter

https://www.2carpros.com/articles/catalytic-converter-replacement

I've attached picture diagnostic steps below for your car for you to test before just replacing. Hope this helps and thanks for using 2CarPros.