Why is my Audi A4's check engine light on and how do I fix it?

I noticed that the check engine light on my Audi A4 has been on for a while now. What could be causing this and what steps should I take to fix it?

The check engine light could be indicating an issue with your engine or emissions system. It's best to take your car to a trusted mechanic to have it diagnosed properly. In the meantime, try tightening your gas cap as it could be a simple fix.

Your check engine light could also be triggered by a faulty oxygen sensor or a problem with the catalytic converter. It's important to get this checked out as soon as possible to avoid any further damage to your car.

I had the same issue with my Audi A4 and it turned out to be a faulty spark plug. Make sure to have your spark plugs checked and replaced if necessary to keep your car running smoothly.