Why is my Vauxhall Astra engine making a knocking noise?

I recently noticed that my Vauxhall Astra's engine has started making a knocking noise. It only happens when the car is idling and disappears once I start driving. What could be causing this issue and what can I do to fix it?

The knocking noise could be caused by several factors such as worn out bearings or low oil levels. It is important to have a mechanic inspect your car to diagnose the issue accurately. In the meantime, make sure to regularly check your oil levels and top up if necessary.

I had a similar issue with my Vauxhall Astra. It turned out to be a problem with the spark plugs. I would suggest getting them checked and replaced if necessary.

If the knocking noise is accompanied by a loss of power or unusual vibrations, it could be a sign of a more serious issue such as a faulty engine mount. It is best to get it checked by a professional to prevent any further damage.