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Audi A4 1997-2001 2.5 TDI Air Flow Meter MAF Sensor Vehicle Model_Fiesta MK4 If your Mercedes S-Class isReplace your cracked, broken, or damaged Audi A4 air flow meter (MAF sensor). What Is a Mass Air Flow Sensor? A mass air flow sensor (MAF) is one of the key components of the electronic fuel injection system in your vehicle. It is typically installed between the air filter and the engine intake manifold. The mass air flow sensor measures the amount of air entering the engine, allowing the system to calculate the correct air to fuel ratio. The mass air