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How to troubleshoot a BMW 4 Series check engine light?

I recently noticed that the check engine light on my BMW 4 Series turned on. What could be the potential causes and how can I address this issue?

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S

The first thing to do is to check your gas cap. A loose, damaged, or missing gas cap can cause the check engine light to turn on.

M

If the gas cap is not the issue, it could be a problem with the oxygen sensor. This sensor measures the amount of oxygen in your exhaust and helps determine the fuel-to-air ratio. A faulty oxygen sensor can cause decreased fuel efficiency and potentially damage other components of your car.

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