Why does my Ford Fiesta's engine make a rattling noise?

I've noticed that my Ford Fiesta's engine has been making a strange rattling noise lately. The car still runs fine, but I'm worried about potential damage. What could be causing this and how can I fix it?

It's possible that your engine's timing chain or belt may be loose, causing the rattling noise. It's important to get this checked out by a mechanic as it could lead to more serious damage if left unfixed.

Another possibility is that your engine's valves may be worn out or damaged. This can also cause a rattling noise and may require replacement or repair.