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Check engine light error code P0420 - 35 - 00 - - Need help!!! on 2003 Volkswagen Jetta

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Hi
Greetings
I am getting the following error code when I analyze my check engine light:

16804 - Catalyst System: Bank 1: Efficiency Below Threshold

P0420 - 35-00 - -

I checked some VW forums and it seems to be a catalytic converter issue. Something to do with the O2 sensors in the front and back. Could anyone give me an idea on what needs to be done and how much it would cost before I take it to a mechanic? I appreciate your response
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