35655-ZZ5-004 Oxygen Sensor - Overview. The 35655-ZZ5-004 Oxygen Sensor is a critical component within Honda marine engine systems, specifically supporting the engine's fuel and emission control system. It continuously monitors the amount of unburned oxygen in the exhaust gases, allowing the engine control unit to adjust the air-fuel mixture to optimize combustion efficiency, reduce emissions, and improve overall engine performance. Engineered to meet factory specifications for dimensions and to