How can I fix the engine light in my Audi A4?

My engine light has been on for a week now and I'm not sure how to fix it. Is this a common issue and how can I resolve it?

First, check your car's manual to see what the engine light may indicate. It could be something as simple as a loose gas cap or something more complex. If it's a minor issue, tighten the gas cap or replace it. If it's a major issue, take your car to a certified Audi mechanic for diagnostics and repairs.