Why is the engine of my Vauxhall Vivaro making strange noises?

I've noticed that my Vauxhall Vivaro's engine has started making strange noises recently. It's not a consistent sound, sometimes it's a loud rattle and other times it's a lower humming noise. I'm worried this might indicate a bigger problem. What could be causing these noises and is it something I should be concerned about?

Hi John, this could be a sign of an issue with the engine components such as the belts or pulleys. It's important to have it checked by a mechanic as soon as possible to prevent any further damage.

I've had a similar issue with my Vauxhall Vivaro and it turned out to be a loose exhaust bracket. Make sure to check all the exhaust components as well.

It could also be a problem with the oil levels or oil filter. Check those first before taking it to a mechanic.