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

I recently purchased a Ford Focus and have noticed that the engine makes a rattling noise when I accelerate. It seems to get louder when I reach higher speeds. Is this normal or should I have it checked out?

It's always a good idea to get any unusual noises checked out by a mechanic, especially since you just purchased the car. It could be nothing, but it's better to be safe than sorry.

I experienced the same issue with my Ford Focus. After getting it inspected, it turned out to be a loose heat shield. Definitely worth having it looked at.

My Ford Focus had a similar issue and it turned out to be a problem with the knock sensor. I would recommend taking it to a trusted mechanic for a diagnosis.