KNOCK SENSOR. The knock sensor is an engine management component designed to detect abnormal combustion vibrations (knocking) within the engine block. It monitors specific frequency vibrations caused by detonation and sends signals to the engine control unit (ECU), which adjusts ignition timing to protect the engine from damage. The sensor typically consists of a piezoelectric element housed in a metal body with an electrical connector. It is mounted directly to the engine block and operates under high temperature and vibration conditions. Proper function ensures optimal engine power, fuel efficiency and protection against harmful detonation. Failure may result in reduced engine performance, increased fuel consumption, unstable operation, ignition-related fault codes or limp mode activation. Common issues include internal sensor failure, poor electrical connection, housing corrosion or wiring damage. Our catalog includes genuine OEM knock sensors, quality aftermarket replacements and tested used units without cracks or connector damage. Used parts are inspected for housing integrity, connector condition and signal functionality. Selection is based on VIN number, engine type and part number. Timely replacement ensures reliable engine protection, stable performance and extended engine life.