37880-PLC-004 Air Temp Sensor - Overview. The Honda 37880-PLC-004 Air Temp Sensor is specifically engineered for Honda marine engine systems to monitor the temperature of the air entering the engine intake manifold. This sensor delivers vital data to the engine control unit (ECU), which uses it to optimize combustion and fuel efficiency, contributing to improved engine performance and reduced emissions. Its role is integral to maintaining reliable and efficient operation in Honda outboard motors