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'm guessing you have a CEL code 23. The Knock sensor is behind the block (under the intake) and should screw out and you can chuck the new one in. I would personally make sure it's tight and check the wire from it to the ECU isn't loose or damaged before replacing it. Hope this link helps http://www.Honda-tech.com/showthread.php?t=1522364

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Q: How do you replace knock sensor on 97 prelude?
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