Hello, I'm Cam. Please include all the details about your issue so I can accurately advise you. I cannot see your vehicle so please be detailed.
This is a very straight forward issue and code.
When that sets it simply means the catalytic converter is not working.
For that code to set the oxygen sensors have to pass a self test and not set codes so the basic diagnosis is to check for leaks in the exhaust, if there is none then replace the catalytic converter.