35655-ZY9-H01 Oxygen Sensor - Overview. The 35655-ZY9-H01 Oxygen Sensor is a critical component in Honda marine engine systems, designed to monitor exhaust gases and ensure optimal engine performance and emissions compliance. This sensor supports the fuel management system, providing real-time data to the engine control unit for precise air-fuel ratio adjustment, essential for reliable and efficient operation. Made to factory specifications, it ensures seamless integration with existing parts, m