How to fix the faulty catalytic converter in an Audi A2?

I recently got an error code for a faulty catalytic converter in my Audi A2. How can I fix this issue myself without having to take it to a mechanic?

The first step is to diagnose the exact problem with your catalytic converter. You can do this by using an OBD-II scanner or taking your car to a mechanic for a diagnostic test. Once you know the issue, you can decide on the best course of action.

If the catalytic converter is completely broken, then it will need to be replaced. However, if it is just clogged or slightly damaged, you can try using a catalytic converter cleaner to see if it can be restored.