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For Bluebird buses equipped with new Diesel Exhaust Fluid (DEF) tank assemblies, these new MFHU (MULTI-FUNCTION HEAD UNIT) sensors fit Cummins diesel engines that are EPA/CARB certified, on highway applied, and built by Cummins on January 1, 2016 or later (Blue Bird production date January 18, 2016). Blue Bird buses equipped with new (DEF) tank assemblies have a Gen 5 Tri-Function Sensor. The Gen 5 Tri-Function Sensor provides the level, concentration, and temperature of the (DEF) Diesel Ex …