Orion Motor Tech for AFH45M14 AFH45M15 5S5775 SU7268 Mass Air Flow Sensor Meter for Nissan D21 Pathfinder Compatible with AFH45M14, AFH45M15, 5S5775, SU7268 Brand new and high quality aftermarket auto parts Makes for a more efficient fuel burning Mass air flow sensors measure the flow and density of the air flowing into the combustion chamber. It is critical for the engine control unit to balance and deliver the correct fuel mass to the engine. A broken mass air flow sensor may cause various problems such as long cranking time, stalling, misfiring, etc. You should have it replaced immediately if it fails. Direct replacement