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Where is the MAF sensor on a 2004 Audi A4 1.8T?

The MAF (Mass Air Flow) sensor on a 2004 Audi A4 1.8T is located in the air intake hose, just before the turbo. It is a small, cylindrical-shaped sensor with a black plastic housing. The MAF sensor is responsible for measuring the amount of air flowing into the engine, and this information is used by the engine control unit (ECU) to calculate the correct amount of fuel to inject.