Why is my BMW 3 Series displaying a check engine light?

I recently purchased a BMW 3 Series and the check engine light has turned on. I am not sure what could be causing this. Is this something serious that needs to be addressed immediately?

The check engine light could indicate a variety of issues, some of which can be minor and others more serious. It is important to have a mechanic diagnose the specific issue in order to determine the proper course of action.

The most common reason for a check engine light in a BMW 3 Series is a faulty oxygen sensor. This is an important component for monitoring emissions and fuel efficiency, so it should be addressed as soon as possible.

Alternatively, the check engine light could be triggered by something as simple as a loose gas cap. Check to make sure the cap is securely fastened before taking your car to a mechanic.