Why does my Vauxhall Vivaro's engine make a knocking sound?

I've noticed that whenever I turn on my Vauxhall Vivaro, the engine makes a loud knocking sound. What could be causing this and how can I fix it?

This knocking sound could be caused by a variety of issues, such as a loose belt or a problem with the fuel system. It's best to take your Vauxhall Vivaro to a trusted mechanic for a diagnostic check to determine the exact cause of the noise.

One common cause of engine knocking in Vauxhall Vivaros is a lack of proper lubrication in the engine. Make sure to regularly check and change your oil to prevent this issue.

Another possible cause of engine knocking is using low quality fuel. Make sure to always use high quality fuel to keep your Vauxhall Vivaro running smoothly.