I have a P0420 code on my VW CC 2010 and I've narrowed it down to a faulty catalytic converter.
I have edited this photo to try and explain easier.
In the red circle is the catalytic converter I want to replace with a mangaflow generic from Autozone. I think that will solve the issue.
In the green is what I'm not sure if needs to be replaced. Is this another catalytic converter?
What is the name of this green and red parts? I asked for a quote on yelp and I had a guy tell me my car has 2 catalytic converters. In the blue there are two oxygen sensors. The dark blue one (downstream) i've replaced before. I'm not sure if I should replace the light blue one.
Apologies for all the questions. I'm really trying to learn here and hopefully make the best purchase for the fix. I will read all replies. Thanks!