This procedure covers the removal and replacement of the crankshaft position sensor on a 2015-2020 Ford F-150 with the 3.5L EcoBoost V6 engine.

Warnings

Tools required

Parts

• Crankshaft Position Sensor × 1 — Motorcraft DY1307 or equivalent
• Dielectric grease × 1 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake
2. Place wheel chocks behind rear wheels
3. Allow engine to cool completely if recently operated
4. Disconnect negative battery cable and wait 2 minutes before proceeding
5. Raise front of vehicle and support securely on jack stands
6. Remove plastic engine undershield if equipped

Procedure

1. 1

   Locate the crankshaft position sensor
   Position yourself under the driver's side of the vehicle. The crankshaft position sensor is mounted on the lower engine block, near the starter motor and oil pan. It has a single electrical connector and is held by one bolt. Use the shop light to locate the sensor clearly before proceeding.
2. 2

   Disconnect the electrical connector
   Locate the electrical connector on the crankshaft position sensor. Press the locking tab on the connector and carefully pull it straight off the sensor. You may need to wiggle it gently while pulling. Ensure the connector does not hang where it can contact hot exhaust components.
3. 3

   Remove the sensor mounting bolt
   Using a 10mm socket with extension, remove the single bolt securing the crankshaft position sensor to the engine block. Keep track of this bolt as it will be reused if in good condition. Note the orientation of the sensor before removal.
4. 4

   Extract the sensor from the engine block
   Carefully pull the crankshaft position sensor straight out from the engine block. It may require some twisting motion to break it free. Be prepared for a small amount of engine oil to drip from the sensor bore. Have a drain pan ready underneath.
5. 5

   Clean the sensor mounting bore
   Inspect the sensor mounting bore in the engine block for any debris, metal shavings, or old gasket material. Clean thoroughly with a clean lint-free cloth. Ensure no debris falls into the engine. Check that the O-ring sealing surface is clean and free of scratches.
6. 6

   Prepare the new sensor
   Inspect the new crankshaft position sensor for any shipping damage. Verify the O-ring is properly seated in the sensor groove. Apply a thin coat of dielectric grease to the O-ring to aid installation and provide a moisture seal. Do not use engine oil or other lubricants.
7. 7

   Install the new sensor
   Carefully insert the new crankshaft position sensor into the mounting bore in the engine block. Push it in by hand until it seats fully against the block. Ensure it is oriented correctly and fully seated before installing the bolt. The sensor should slide in smoothly without excessive force.
   Torque spec

   Crankshaft Position Sensor10 Nm (7 lb-ft)
8. 8

   Torque the sensor mounting bolt
   Install the sensor mounting bolt and hand-tighten first. Using a torque wrench, tighten the bolt to the specified torque of 10.0 Nm (7.0 lb-ft). Do not overtighten as this can crack the sensor housing or strip the threads in the aluminum block.
   Torque spec

   Crankshaft Position Sensor10 Nm (7 lb-ft)
9. 9

   Reconnect the electrical connector
   Apply a small amount of dielectric grease to the inside of the electrical connector to prevent corrosion. Push the connector firmly onto the crankshaft position sensor until you hear and feel it click into place. Gently tug on the connector to verify it is locked.
10. 10

    Reinstall undershield and lower vehicle
    Reinstall the plastic engine undershield if it was removed. Ensure all fasteners are secure. Carefully lower the vehicle from the jack stands. Remove wheel chocks.
11. 11

    Reconnect battery and clear codes
    Reconnect the negative battery cable and tighten securely. If a check engine light was present, use an OBD-II scanner to clear any stored crankshaft position sensor codes. This will allow you to verify the repair resolved the issue.

Reassembly

1. Ensure the crankshaft position sensor electrical connector is fully seated and locked
2. Verify the sensor mounting bolt is torqued to specification and not over-tightened
3. Confirm no tools or parts were left in the engine compartment or underneath the vehicle

Verification

• Start the engine and verify it starts normally without extended cranking
• Allow engine to idle and listen for smooth operation without misfires or rough running
• Use an OBD-II scanner to verify no crankshaft position sensor codes are present
• Test drive the vehicle to ensure normal operation under load
• Recheck the sensor area for any oil leaks after test drive
• Verify tachometer reads correctly and smoothly during operation

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