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What is the most common cause of engine knocking in Audi vehicles?

I have recently noticed a knocking sound coming from my Audi's engine. I am wondering what could be causing this issue and if there are any steps I can take to fix it.

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The most common cause of engine knocking in Audi vehicles is usually due to low quality or contaminated fuel. It is recommended to always use high quality fuel and to have your fuel system regularly cleaned.

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Another common cause of engine knocking in Audi vehicles is worn out spark plugs or ignition coils. These should be replaced regularly to avoid engine knocking and other potential issues.

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