With reference to your inquiry on this Cardone Mass Air Flow Sensor (MAF) - Remanufactured (Part No. 74-50031), the Mass Air Flow Sensor is located between the resonator housing and the lower air cleaner box, which is in front of the left fender-well below the headlight (the bumper conceals it). The sensor is on the lower part of the air inlet pipe on your 2009 ford focus se. For any further assistance, please feel free to call us at: 1-877-238-2623 or visit the nearest Advance Auto Parts store and one of our Parts Pros will gladly assist you with any questions or concerns you may have.
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