How to fix the engine in my Audi A4?

I recently noticed that my Audi A4's engine is making a strange noise. How can I fix it?

First, check the oil levels and make sure they are at the recommended level. If the oil is low, it could be causing the noise. Try adding more oil and see if the noise goes away.

If the oil levels are fine, then it could be a problem with the spark plugs. They might need to be replaced or cleaned. You can also try using a fuel injector cleaner to see if that helps with the noise.