How to troubleshoot a Ford Mondeo's Check Engine light?

I recently noticed that the Check Engine light on my Ford Mondeo has been turning on frequently. What could be the possible causes for this and how can I fix it?

The most common reason for the Check Engine light to turn on in a Ford Mondeo is a faulty oxygen sensor. You can get this checked and replaced by a mechanic.

Another possible cause could be a loose gas cap. Make sure to tighten it and see if the light turns off after a few driver cycles.

It could also be an issue with the catalytic converter. Have a trained technician inspect it and replace if necessary.