Why is my Vauxhall Insignia's engine making a loud knocking noise?

I recently noticed that my Vauxhall Insignia's engine is making a loud knocking noise. It seems to be coming from the engine bay and gets louder when I accelerate. I'm worried that there might be a serious problem. What could be causing this and what should I do about it?

It is possible that this is a sign of low oil pressure or a worn out engine bearing. It is important to have this checked out by a mechanic as soon as possible to avoid any further damage.

Another possible cause could be a loose or damaged timing belt. This is a critical component of your engine and should be addressed immediately to avoid potential engine failure.

In some cases, a knocking noise could also indicate a problem with the fuel injectors or spark plugs. These should be inspected and possibly replaced if necessary.