Why is my Audi A6 engine making a strange knocking noise?

I noticed that my Audi A6 engine has started to make a strange knocking noise when I accelerate. It's not very loud, but it's definitely noticeable. What could be causing this and how can I fix it?

It's possible that your engine is low on oil or the oil needs to be changed. This can cause the engine to make unusual noises. Check your oil level and consider getting an oil change if it's been a while since your last one.

Another common cause of engine knocking is a problem with the fuel or air intake system. Make sure your fuel filter is clean and check your air filter for any clogs. If those are both in good condition, you may need to have your fuel injectors checked.

If your Audi A6 has been running hot or overheating, this could also be the cause of the knocking noise. Check your coolant levels and make sure your radiator and other cooling components are in good condition. It's important to address any overheating issues to avoid causing damage to your engine.