Why is my Ford S-Max showing a check engine light?

I've noticed that my Ford S-Max has a check engine light constantly on. What could be causing this and how can I fix it?

Hi John, a check engine light can indicate a variety of issues with your car. It's best to take it to a mechanic to have it diagnosed and repaired.

I had the same issue with my Ford S-Max. It turned out to be a faulty oxygen sensor. I suggest taking it to a trusted mechanic for a proper diagnosis.

Make sure to check your gas cap and tighten it if necessary. A loose gas cap can also cause the check engine light to come on.