This procedure covers removal and replacement of the front ABS wheel speed sensor on a 2011-2014 Ford F-150 4WD with 5.0L V8 engine.

Warnings

Tools required

Parts

• Front ABS wheel speed sensor × 1 — Motorcraft DY-1253 or equivalent
• Sensor retaining bolt × 1 — Use OEM specification if corroded

Preparation

1. Park vehicle on level surface and engage parking brake
2. Place wheel chocks behind rear wheels
3. Loosen front wheel lug nuts 1/4 turn while vehicle is on ground
4. Raise front of vehicle with floor jack and support securely on jack stands at frame rails
5. Remove front wheel completely

Procedure

1. 1

   Locate the ABS sensor
   The front ABS wheel speed sensor is mounted on the steering knuckle behind the brake rotor assembly. The sensor wire runs up through a series of clips along the frame rail toward the ABS module. Identify the sensor body and the electrical connector routing.
2. 2

   Disconnect electrical connector
   Follow the sensor wire harness up from the sensor to locate the electrical connector (typically near the upper control arm or frame rail). Press the connector lock tab and pull the connector halves apart. Do not pull on the wires themselves.
3. 3

   Remove wire harness clips
   Release the sensor wire from any retaining clips along the frame rail and suspension components. Some clips may be press-fit while others may have small tabs. Use a flat blade screwdriver carefully to release stubborn clips without breaking them. Keep track of clip locations for reinstallation.
4. 4

   Remove sensor retaining bolt
   Using an 8mm socket, remove the single bolt securing the ABS sensor to the steering knuckle. The bolt threads into the knuckle from the front. If the bolt is corroded and difficult to remove, apply penetrating oil and allow to soak for several minutes before attempting removal.
   ⚠Bolt may be corroded in place. Do not force or you may break the sensor body or damage threads in the knuckle.
5. 5

   Remove sensor from knuckle
   Carefully pull the sensor straight out from the steering knuckle bore. The sensor may be stuck due to corrosion or debris. If stuck, gently wiggle while pulling. Do not pry against the sensor body as it is fragile plastic. If necessary, carefully use a small screwdriver between the knuckle and sensor mounting flange only.
6. 6

   Clean mounting bore and tone ring
   Use a wire brush to clean the sensor mounting bore in the knuckle, removing any rust, dirt, or debris. Inspect the tone ring (toothed ring on the hub assembly) for damage, missing teeth, or excessive rust buildup. Clean the tone ring surface with a wire brush if needed. Spray electrical contact cleaner in the mounting bore and allow to dry.
   ⚠Ensure tone ring teeth are not damaged or missing. A damaged tone ring will require hub assembly replacement to fix ABS function.
7. 7

   Prepare new sensor
   Remove new sensor from packaging and verify it matches the old sensor design. Apply a thin coat of dielectric grease to the electrical connector on the sensor side. Inspect the sensor tip O-ring (if equipped) and ensure it is properly seated. Do not apply grease to the sensor tip itself.
8. 8

   Install new sensor
   Carefully insert the new sensor straight into the steering knuckle bore. Push it in fully by hand until the mounting flange contacts the knuckle face. Ensure the sensor is fully seated before installing the bolt. The sensor should slide in with minimal resistance if the bore was cleaned properly.
9. 9

   Install and torque sensor bolt
   Insert the sensor retaining bolt and thread it in by hand to ensure proper alignment. Using a torque wrench and 8mm socket, tighten the bolt to exactly 10 Nm (7 lb-ft). This is a very low torque specification - do not overtighten.
   ⚠️Critical torque specification: 10 Nm (7 lb-ft) ONLY. Exceeding this value will crack the sensor housing or strip the aluminum knuckle threads.
   Torque spec

   ABS Sensor Bolt10 Nm (7 lb-ft)
10. 10

    Route and secure wire harness
    Route the sensor wire harness back through the original path, ensuring it does not contact any moving parts, sharp edges, or heat sources. Reinstall all wire retaining clips in their original locations. Ensure the wire has adequate slack and is not stretched tight during suspension travel.
11. 11

    Connect electrical connector
    Reconnect the sensor electrical connector, ensuring it clicks fully into place. Give a gentle tug to verify the connector is locked. Ensure the connector seal is properly seated to prevent moisture intrusion.
12. 12

    Reinstall wheel
    Mount the wheel back onto the hub and hand-thread all lug nuts. Lower the vehicle until the tire just contacts the ground (still supported mostly by jack stands). Torque the lug nuts to specification in a star pattern. Then fully lower the vehicle and perform a final torque check on all lug nuts.
    Torque spec

    Wheel Lug Nuts169 Nm (125 lb-ft)

Reassembly

1. Ensure all wire harness clips are properly secured and the wire routing matches the original configuration
2. Verify electrical connector is fully seated and locked with no exposed terminals
3. Double-check that sensor mounting bolt was torqued to exactly 10 Nm (7 lb-ft) - this is critical

Verification

• Start the engine and verify the ABS warning light illuminates briefly during bulb check, then turns off within a few seconds
• If ABS light remains on, use a scan tool to check for active ABS codes and verify the sensor is reading properly
• Test drive the vehicle at speeds above 20 mph and verify the ABS system initializes without warning lights
• Perform a controlled stop on dry pavement and verify ABS engages properly if needed (optional advanced test)

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