How to troubleshoot a rattling noise in a Vauxhall Insignia?

I recently purchased a used Vauxhall Insignia and have noticed a rattling noise coming from under the hood. It's especially noticeable when I accelerate. What could be causing this and how can I fix it?

The rattling noise could be caused by a loose heat shield or exhaust system. Check for any loose bolts or fasteners and tighten them accordingly.

Another possible cause could be a failing timing chain tensioner. It's best to take your car to a mechanic to have it properly diagnosed and repaired.

If you recently changed your oil, it's possible that the wrong viscosity was used. This could cause the engine to make unusual noises. Make sure you are using the recommended oil for your vehicle.