Mass Air Flow Sensor
WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
The MAF sensor is located on the intake air duct just after the air filter housing. The ECM uses data from the MAF sensor and other air intake sensors to determine the quantity of air entering the engine. In addition, the MAF sensor has a major impact on EGR calculations and Selective Catalytic Reduction (SCR) dosing.