Why is the check engine light on in my BMW X5?

I recently purchased a used BMW X5 and noticed that the check engine light is on. How serious is this issue and what could be causing it?

There could be several reasons why the check engine light is on, including a loose gas cap, a faulty oxygen sensor, or a problem with the catalytic converter. It's best to take your X5 to a certified mechanic to diagnose and fix the issue.

In my experience, the check engine light in BMWs can often be related to a sensor or emissions issue. It's important to have this checked out as soon as possible to prevent any further damage to your vehicle.