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

I recently noticed a rattling noise coming from the engine of my Vauxhall Insignia. It seems to be more noticeable when the car is idling. What could be causing this and how can I fix it?

This rattling noise could be due to a loose or worn out serpentine belt. I recommend checking the belt for any signs of wear and tear and replacing it if necessary.

It's possible that the noise is coming from the exhaust heat shield, which can often become loose and cause rattling. You may need to tighten or replace the heat shield.

Another common cause of engine rattling in the Vauxhall Insignia is a faulty timing chain tensioner. This can be a more complex repair, so it's best to take your car to a certified mechanic for a proper diagnosis and repair.