A Mass Airflow — MAF — Sensor in a modern Ford vehicle is located inside the air intake duct. It uses a hot wire element to measure the amount of air entering the engine. The element is cooled as air passes over it, and this information is converted into an electronic pulse to be relayed to the on-board computer, which can then calculate fuel injection functions. If you suspect a malfunction in this system, check both the MAF sensor and its power supply.
Check the MAF Sensor is Receiving Voltage
Turn the ignition on but do not start the engine. Raise the vehicle’s hood and prop it open. Locate the MAF sensor’s electrical connector on the air intake duct in the front, center of the engine.