What is the cause of Audi engine knocking?

I've noticed a knocking sound coming from the engine of my Audi. Can anyone tell me what might be causing it?

The most common cause of engine knocking in Audis is low fuel quality. Make sure to use high-quality fuel to avoid this issue.

It could also be due to a buildup of carbon deposits on the fuel injectors. Try using a fuel injector cleaner to see if it helps.

I've had a similar issue with my Audi and it turned out to be a faulty sensor. Have your car checked by a mechanic to diagnose the exact cause.