How to fix the engine light on my Audi A4?

I recently purchased a used Audi A4 and the engine light keeps coming on. I'm not sure what could be causing it. Can someone help me figure out how to fix it?

The engine light could be indicating a number of issues, from a simple loose gas cap to a more serious problem with your engine. It's important to get it checked out by a certified mechanic right away.

A common issue with Audi A4s is faulty oxygen sensors, which can trigger the engine light. Have a mechanic check these sensors and replace them if necessary.

Another possibility is a problem with the catalytic converter. This is a more expensive fix, so make sure to get a diagnostic test done before replacing it.