Why is my Ford Focus's engine making a rattling noise?

I recently bought a 2015 Ford Focus and I've noticed that the engine makes a rattling noise when I accelerate. What could be causing this and how can I fix it?

It's possible that the rattling noise is coming from a loose exhaust heat shield. You can try tightening it or getting it replaced if necessary.

Another common culprit for engine rattling is a worn out timing chain or belt. This is a more serious issue and should be addressed by a mechanic as soon as possible.