The Facet Knock Sensor - 93193 is a sensor used in automotive engines to detect and measure the vibrations caused by engine knock. It is designed to monitor the performance of the engine and provide feedback to the engine control unit, allowing for adjustments to be made to prevent damage to the engine. This knock sensor is a reliable and durable component, made with high-quality materials to ensure accurate and consistent readings. It is compatible with a wide range of vehicle makes and models, making it a versatile and essential tool for engine maintenance and performance.