Why is the Ford Mondeo's check engine light on?

I recently bought a used Ford Mondeo and noticed that the check engine light is on. Is this something I need to worry about or is it a common issue with this model? What could be causing it?

It's important to get your check engine light checked out to determine the cause. It could be something simple like a loose gas cap, or it could be a more serious issue.

Based on my experience with Ford Mondeos, the most common reason for the check engine light is a faulty O2 sensor. It's easy to fix, so don't worry too much.

Don't ignore the check engine light, it could be indicating a problem with your emissions control system. Have a mechanic take a look to avoid any potential issues.