This procedure covers the removal and replacement of the Mass Air Flow (MAF) sensor on a 2015-2020 Ford F-150 with the 5.0L Coyote V8 engine.

Warnings

Tools required

Parts

• Mass Air Flow (MAF) Sensor × 1 — Motorcraft DY-1345 or equivalent

Preparation

1. Ensure engine is cool to the touch
2. Open hood and secure with prop rod
3. Locate the MAF sensor on the air intake tube between the air filter box and throttle body on the driver's side of engine bay
4. Disconnect the negative battery terminal if replacing the sensor to clear any stored fault codes (optional but recommended)

Procedure

1. 1

   Disconnect MAF sensor electrical connector
   Press down on the red safety tab on the MAF sensor electrical connector, then pull the connector straight out from the sensor body. Do not pull on the wiring harness itself. If connector is tight, gently wiggle side-to-side while pulling.
2. 2

   Loosen upstream air intake clamp
   Loosen the hose clamp securing the air intake tube to the air filter box side of the MAF sensor using a flathead screwdriver or 7mm socket. Do not remove the clamp completely; loosen just enough to allow tube movement.
   Torque spec

   Air Intake Clamps3 Nm (2 lb-ft)
3. 3

   Loosen downstream air intake clamp
   Loosen the hose clamp on the throttle body side of the MAF sensor housing using a flathead screwdriver or 7mm socket. Again, loosen sufficiently to allow separation but do not remove completely.
   Torque spec

   Air Intake Clamps3 Nm (2 lb-ft)
4. 4

   Remove MAF sensor mounting screws
   Using a T20 Torx driver, remove the two Torx screws securing the MAF sensor to the intake tube housing. These screws are typically located on opposite sides of the sensor body. Keep screws in a safe location for reinstallation.
   Torque spec

   MAF Sensor Screws3 Nm (2 lb-ft)
5. 5

   Remove MAF sensor from intake tube
   Carefully pull the MAF sensor straight out of the intake tube housing. The sensor may have an O-ring seal that creates slight resistance. Inspect the O-ring on the old sensor; if replacing the sensor, transfer a new O-ring from the replacement part.
6. 6

   Inspect and clean intake tube (if reusing sensor)
   If cleaning and reusing the original sensor, inspect the intake tube for debris, oil contamination, or damage. Wipe clean with a lint-free cloth. If replacing the sensor, ensure the mounting surface in the intake tube is clean and free of debris.
7. 7

   Install new or cleaned MAF sensor
   Carefully insert the new or cleaned MAF sensor into the intake tube housing, ensuring the O-ring is properly seated and the sensor is oriented correctly with the electrical connector facing the proper direction (should match original orientation). Push firmly until fully seated.
8. 8

   Install MAF sensor mounting screws
   Install the two T20 Torx screws through the sensor body and into the intake tube. Hand-tighten first to ensure proper threading, then torque to specification using a torque driver. Alternate between screws for even seating.
   Torque spec

   MAF Sensor Screws3 Nm (2 lb-ft)
9. 9

   Tighten air intake clamps
   Tighten both upstream and downstream hose clamps to specification. Ensure the intake tube is properly seated on both sides before final tightening. The tube should not be twisted or kinked.
   Torque spec

   Air Intake Clamps3 Nm (2 lb-ft)
10. 10

    Reconnect electrical connector
    Push the electrical connector firmly onto the MAF sensor until it clicks into place and the red safety tab locks. Tug gently on the connector to verify it is fully seated and secure.

Reassembly

1. If battery was disconnected, reconnect the negative terminal
2. Double-check that all clamps are tight and the electrical connector is fully engaged
3. Ensure no tools or parts were left in the engine bay

Verification

• Start the engine and allow it to idle for 30-60 seconds; listen for any unusual air intake noises that might indicate a loose connection
• Check for vacuum leaks by listening for hissing sounds around the MAF sensor and intake tube connections
• Verify that the check engine light does not illuminate with MAF-related codes (P0100-P0104 range)
• Test drive the vehicle and confirm smooth acceleration and idle quality; the engine should respond normally to throttle inputs without hesitation
• If issues persist, use an OBD-II scanner to verify MAF sensor readings are within normal range (typically 3-8 grams/second at idle when warm)

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