How do I tell if my Audi 80 needs a new catalytic converter?

I recently bought a used 1992 Audi 80 and it seems to have reduced power and a strange odor coming from the exhaust. I'm wondering if it's a problem with the catalytic converter. How can I determine if it needs to be replaced?

Start by checking for a fault code with an OBD II scanner. If the code indicates a catalyst efficiency problem, it could be a sign that your catalytic converter needs to be replaced.

Another way to check is to visually inspect the catalytic converter for any damage or discoloration. If it appears to be damaged or discolored, it may need to be replaced.

You can also perform a backpressure test on the exhaust system to see if there is any blockage in the catalytic converter. If the backpressure is too high, it could indicate a problem.