30530-P8F-A01 Knock Sensor Assembly - Overview. The 30530-P8F-A01 Knock Sensor Assembly is an essential component in Honda marine engine systems, designed to detect engine knocking or detonation. It plays a vital role in maintaining optimal engine performance by sending precise signals to the engine control unit to adjust ignition timing accordingly. This process helps prevent engine damage, improves fuel efficiency, and enhances overall reliability of the marine engine.. Key Features. Genuine O