Seller notes

Price listed is for one OEM quality knock sensor made to OE specifications. Our knock sensor product has a piece of piezoelectric ceramic inside. The most right picture above show the presence of the ceramic. When you purchase an knock sensor, always ask seller if the Piezoelectric Ceramic is included. The piezoelectric ceramic is acting as an amplifier. When the Knock happens, it will warn the ECU (Engine Control Unit). The ECU will then delay the ignition timing. Without this piezoelectric cer...

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