What should I do when my Ford Galaxy's check engine light is on?

I've noticed that the check engine light in my Ford Galaxy has turned on. I'm not sure what could be causing it, and I'm worried it could be a serious issue. Can anyone provide some advice on what steps I should take?

I had the same issue with my Ford Galaxy and it turned out to be a faulty oxygen sensor. It's best to take your car to a mechanic and have them run a diagnostic test to determine the exact issue.

Before bringing it to a mechanic, try checking your gas cap to make sure it's tightened properly. A loose gas cap can cause the check engine light to turn on.