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The 2002 Nissan Xterra has its mass air flow sensor situated in the left rear area of the engine compartment, specifically in the intake air duct to the right of the air cleaner. The MAF sensor is a crucial component that informs the car's computer about the amount of air entering the engine. This information helps the engine adjust its performance by regulating the intake of air, ensuring the engine operates at its optimal state. While it is possible to drive with a faulty mass air flow sensor temporarily, it is not recommended to do so for an extended period. Ignoring issues with the MAF sensor could lead to more significant engine problems beyond just the sensor malfunction.
In the 2002 Nissan Xterra, the mass air flow sensor can be found in the rear left side of the engine compartment, inside the intake air duct next to the air filter box.