How do I troubleshoot a Check Engine light on my Audi A4?

My Audi A4's Check Engine light came on suddenly while driving. What could be the cause and how can I resolve it?

First and foremost, don't panic. The Check Engine light can indicate various issues, ranging from minor to more serious. It's important to get your car to a qualified mechanic as soon as possible to read the error codes and accurately diagnose the problem.

One possible cause of a Check Engine light on an Audi A4 is a faulty oxygen sensor. This can lead to decreased fuel efficiency and potentially cause damage to your engine over time. It's best to have it checked and replaced if necessary by a certified Audi technician.