Why is the engine of my Audi A4 making a strange knocking noise?

I've noticed a unusual knocking noise coming from the engine of my Audi A4. It gets louder when I accelerate. What could be causing this issue and how can I fix it?

It's possible that your engine is overheating, causing the parts to expand and make a knocking noise. Check your coolant levels and have your radiator and thermostat checked. Also, make sure to change your oil regularly to prevent engine overheating.

Another possible cause could be worn out engine bearings. Have a mechanic check the bearings and replace them if necessary. It's important to address this issue as worn bearings can cause major engine damage.