Why is my Nissan Navara's engine making a strange sound?

My Nissan Navara's engine has been making a strange sound for the past week. It almost sounds like a rattling noise. What could be causing this and should I be concerned?

Hi Samantha, it's most likely that your engine is experiencing a problem with its timing chain. It's important to have this checked and repaired as soon as possible to avoid any further damage to your engine.