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Q: Knock control cylinders -- How bad is that? on 2003 Volkswagen Jetta

Engine light recently came on - off, and back on. Had codes pulled out at my local service station and this is what they got: 17734 - knock control cylinder 2 - control limit reached, 17735 knock control cylinder 3 - control limit reached, and 17550 - load detection lower limit not reached. Planning taking it to the shop, but would like to know what to expect. thanks for your input.
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