Why is the Ford Fiesta's engine making unusual noises?

I recently bought a Ford Fiesta and noticed that the engine is making strange noises. It sounds like whirring or rattling coming from under the hood. What could be the cause of this and how can I fix it?

It is possible that there is an issue with the timing belt or a problem with the engine's valves. I would recommend bringing your car to a trusted mechanic for a thorough inspection.

Check your oil level and see if it needs to be topped off. Low or dirty oil can also cause strange engine noises.

Another possibility could be a loose or damaged pulley, which can cause the engine to make unusual noises. Have a mechanic check this out as well.