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Message: <blockquote data-quote="KiNaKa" data-source="post: 134693" data-attributes="member: 184">Vincent,Knock sensor task is to detects vibrations at the crankcase.It is a self contained system. Inside the knock sensor are piezo crystal. The screened cable is fitted directly onto the knock sensor.Any vibration which occur are converted with the aid of the piezo ceramic into electrical signals. Piezo-electric effect: If a mechanical force acts on a crystal, electrical voltages are produced. Knock sensor signals may also indicate engine damage, Example : increased engine noise resulting from a widened piston.hope this help</blockquote>