Why is my Vauxhall Astra's engine making a strange sound?

I recently noticed that my Vauxhall Astra's engine has started making a strange sound. It's like a rattling or knocking noise. What could be causing this and how can I fix it?

The most common reason for a strange engine noise in a Vauxhall Astra is a problem with the timing chain. This can cause the engine to make a rattling or knocking noise. It's important to get this fixed as soon as possible to avoid any further damage to the engine.

Another possible cause could be an issue with the exhaust or muffler. A loose or damaged exhaust can cause a rattling sound, while a faulty muffler can create a loud banging noise. It's best to have a mechanic inspect the exhaust system to determine the exact cause.

In some cases, the strange engine noise could be due to low oil levels or a dirty oil filter. Make sure to check your oil levels regularly and replace the oil filter as recommended by your car's manufacturer.