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Why does my Audi A3's engine make a strange knocking noise?

I recently purchased an Audi A3 and have noticed a strange knocking noise coming from the engine. It seems to happen intermittently and I'm worried about possible engine damage. Can anyone offer insight into this issue?

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It's common for Audi A3's to experience engine knocking due to a faulty fuel pump. Have it checked by a certified mechanic to determine the cause and necessary repairs.

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