?Applicable ?Car Knock Sensor Fit for Fit for SX4 XL-7 . Professional manufacturing, high accuracy and ,Reference OEM: 18640-78G00?. ?Excellent Material?Adopted high quality aluminum alloy +hose material, the quality of the parts will small, which can better save oil for vehicles. High strength, good stiffness, , not easy to fade. ?Excellent Function?The knock sensor is typically mounted on a motor generator for detecting whether the engine may have a knocking in order to adjust the ignition advance time by electronic control system to avoid the occurrence of knocking. ?3 Methods Detect The Engine Knock?Detect changes in the pressure of the engine combustion chamber; Detect the frequency of the engine cylinder vibration; Detect the noise of mixed gas combustion. ?Esay to Install?100% Brand New Aftermarket Knock Sensor with Premium Quality. Easy to install, match to your original car. A direct replacement for the old one or broken one.