Due to many reasons, you will hear unusual noises from the Audi engine. Among the different noises produced from the car, the knocking noise is commonly produced due to mechanical problems in the engine. The sound can be more intense when you step on the gas pedal. If you want to prevent the knocking noise, then you need to determine the main causes behind it. The following slide helps you to determine the causes behind the knocking sound produced from the Audi.