Why is my Audi 80's check engine light on?

I just got a check engine light on my Audi 80. What could be causing this and how can I fix it?

It could be a variety of issues causing the check engine light to turn on. The best course of action would be to have a mechanic run a diagnostic test to determine the exact problem.

Some common reasons for the check engine light to come on include a loose gas cap, faulty oxygen sensor, or a malfunctioning catalytic converter. Check these components first before taking it to a mechanic.