Mass airflow sensors (MAF) measure the amount of air by weight through changing voltages or frequencies and sends this information to the onboard computer. The computer uses this and other inputs to calculate the correct amount of fuel delivered. Symptoms of MAF Sensor failure include poor starting, engine surging, engine stalling, a check engine light, and no-start conditions. Mass AirFlow Sensors are non-serviceable, replace your MAF sensor that is non-functional. As an ISO 9001:2015/TS16949 certified company, Walker Products began supplying the fuel system and Engine Management needs of the automotive industry since 1946. Our products include Carburetor and Fuel Injection Repair Kits, Oxygen Sensors and other Engine Management products such as Throttle Position Sensors, Cam and Crankshaft Sensors, Fuel Injectors, Spark Plug Wires and Gaskets. Fit: Ford Escape 2016-2013, Ford F-250 Super Duty 2016-2011, Ford F-350 Super Duty 2016-2011, Ford F-450 Super Duty 2016-2011, Ford F-550 Super Duty 2016-2011, Ford Transit Connect 2015-2014