The airflow sensor (MAF sensor - Mass Airflow Sensor) on a 2004 Dodge Sprinter is located in the air intake tube,
between the air filter housing and the throttle body. It's usually a fairly prominent, rectangular sensor with a wire harness plugged into it.
To be certain, you should consult your Sprinter's repair manual or a reliable online diagram specific to your engine type (e.g., 2.7L CDI, 3.0L CDI, etc.). The location might vary slightly depending on the engine and any modifications to the intake system.
