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What is the cause of my Audi 80's engine error code P0420?

I recently received the code P0420 on my Audi 80, signaling a problem with my catalytic converter's efficiency. What could be causing this and how should I address it?

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The most common cause of a P0420 code in an Audi 80 is a faulty catalytic converter. It may need to be replaced or repaired in order to solve the issue.

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