This procedure covers the removal and replacement of the boost pressure sensor on the 3.5L EcoBoost V6 engine, which monitors turbocharger boost pressure for the engine control module.

Warnings

Tools required

Parts

• Boost pressure sensor × 1 — Motorcraft CM-5317 or equivalent
• Boost sensor O-ring seal × 1 — Use OEM specification

Preparation

1. Ensure engine is completely cool to the touch
2. Park vehicle on level ground and set parking brake
3. Disconnect negative battery terminal and wait 2 minutes for systems to power down
4. Locate boost pressure sensor on driver-side intake manifold near turbocharger outlet

Procedure

1. 1

   Access boost pressure sensor
   Remove the engine cover by pulling upward on the front and rear edges to release the mounting grommets. Set aside. Identify the boost pressure sensor on the intake manifold between the turbocharger outlet and throttle body on the driver side.
2. 2

   Disconnect electrical connector
   Press down on the connector locking tab while pulling the electrical connector straight away from the sensor. Do not twist or rock the connector. If connector is stuck, use a small flathead screwdriver to gently release the secondary lock tab.
3. 3

   Remove boost pressure sensor
   Using a 10mm socket, remove the single mounting bolt securing the boost pressure sensor to the intake manifold. Keep track of any washers or spacers. Carefully twist and pull the sensor straight out of the intake manifold bore.
   Torque spec

   Boost Sensor15 Nm (11 lb-ft)
4. 4

   Inspect sensor port and O-ring
   Examine the intake manifold bore for debris, carbon buildup, or damage. Remove the old O-ring seal from the sensor port using a pick tool. Clean the bore with a shop towel. Do not allow debris to fall into the intake manifold.
5. 5

   Prepare new sensor
   Install the new O-ring seal onto the new boost pressure sensor. Lightly lubricate the O-ring with clean engine oil to ease installation and prevent tearing. Verify the sensor tip is clean and free of protective caps or packaging material.
6. 6

   Install new boost pressure sensor
   Carefully insert the new sensor straight into the intake manifold bore, ensuring the O-ring seats properly. Align the mounting hole and hand-thread the mounting bolt to prevent cross-threading. Torque the mounting bolt to specification using a torque wrench.
   Torque spec

   Boost Sensor15 Nm (11 lb-ft)
7. 7

   Reconnect electrical connector
   Push the electrical connector onto the sensor until it clicks into place. Verify the locking tab is fully engaged. Gently tug on the connector to confirm it is secure and will not pull off.
8. 8

   Reinstall engine cover
   Align the engine cover mounting grommets with the ball studs on the engine. Press down firmly on all mounting points until the cover snaps into place and sits flush.
9. 9

   Reconnect battery and clear codes
   Reconnect the negative battery terminal. If equipped with a scan tool, clear any stored diagnostic trouble codes related to boost pressure. If no scan tool is available, the codes will clear after successful drive cycles.

Reassembly

1. Ensure all electrical connections are secure and locked in place
2. Verify engine cover is properly seated on all mounting points
3. Double-check that no tools or parts were left in the engine bay

Verification

• Start the engine and verify it idles smoothly with no unusual noises or warning lights
• Rev the engine gently to 2000-2500 RPM and listen for vacuum leaks or hissing sounds around the sensor
• If equipped with a scan tool, monitor boost pressure sensor readings at idle (should show near atmospheric pressure, approximately 14.7 psi or 101 kPa)
• Perform a test drive including moderate acceleration to verify proper boost pressure response and no check engine light activation
• Recheck for diagnostic trouble codes after test drive to confirm sensor is functioning correctly

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