Why is my Ford Transit Custom making a loud rattling noise while idling?

I've noticed that my Ford Transit Custom is making a loud rattling noise while idling. What could be causing this and is it something I should be concerned about?

The rattling noise could be caused by a loose or damaged belt, or possibly a faulty tensioner. It's best to have this checked by a mechanic to determine the exact cause and avoid any potential further damage.

You may also want to check the engine oil level and see if it needs to be topped up. Low oil levels can sometimes cause unusual noises in the engine. If the noise persists, take it to a mechanic for a diagnosis.

Is there any chance that the noise is coming from the exhaust system? It's possible that a component may have come loose and is causing the rattling. Have a mechanic check for any loose parts and make necessary repairs.