The DELPHI Mass Air Flow (MAF) Sensor, part number AF10391-12B1, is a critical component for modern engine management systems. It precisely measures the volume and density of air entering the engine's intake, providing vital data to the Engine Control Unit (ECU). By accurately reporting airflow, the MAF sensor allows the ECU to calculate the correct amount of fuel to inject for combustion. This leads to improved fuel efficiency, reduced emissions, and smoother engine operation. A malfunctioning MAF sensor can cause a range of issues, including poor acceleration, rough idling, increased fuel consumption, and the illumination of the check engine light. This DELPHI sensor is engineered for reliability and accuracy, meeting or exceeding original equipment specifications. Its robust construction ensures durability under demanding engine conditions. Proper installation and maintenance of the MAF sensor are essential for maintaining peak engine performance and longevity.