Why is the check engine light on in my Ford Focus?

I recently purchased a 2012 Ford Focus, and after driving for a few weeks, the check engine light has turned on. I'm not sure what could be causing this, but I'm worried it may be something serious. Can anyone offer any advice on what I should do?

It's important to take your car to a mechanic as soon as possible when the check engine light turns on. They can run diagnostics and determine the issue.

Sometimes a loose gas cap can trigger the check engine light. Make sure yours is tightened and see if the light goes off.

I had a similar issue with my Ford Focus, and it turned out to be a faulty oxygen sensor. It's important to get this fixed as it can affect your car's performance.