2003 Audi A4 Quattro Q&A

2003 Audi A4 Quattro Question: i can hear my engine knocking only sometimes when i turn my car off. any help?

it a 2003 Audi A4 1.8t inline 4. for some reason only occasionally will i hear the engine knock only when i shut off it never does it while i drive or turn it on. just when i turn the ignition off. if anybody knows please help. thanks. -
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