Ford Mass Air Flow Sensor LC3A-12B579-BA Engine Intake Stabilization

Ford, Focus, Escape, Mondeo and other models with 1.5T/2.0T EcoBoost engines may use OEM LC3A-12B579-BA Ford mass air flow sensor. Uses a precise thermal-film sensing element in a high-temperature engineering plastic housing; stable signal output to ECU to accurately control air-fuel ratio, preventing idle instability or surge. Installation requires removing the intake pipe and carefully unplugging the original sensor; difficulty moderate.