Malibu M Series Knock Sensor - OEM Engine Detonation SensorRestore smooth, reliable performance in your Malibu M Series engine with this genuine Malibu Boats knock sensor. Designed to detect engine knock (detonation) and send a precise signal to the ECU, this sensor helps the engine maintain optimal timing for strong power, efficient operation, and added protection under loadespecially important for watersports use. Application: Malibu M Series engines (verify fitment by engine ECU requirements) Function: