This procedure covers the removal and replacement of the front ABS wheel speed sensor on a 2012-2018 Jeep Wrangler with the 3.6L V6 engine.

Warnings

Tools required

Parts

• Front ABS wheel speed sensor × 1 — Mopar 68238098AA or equivalent
• Sensor mounting 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. If available, use a scan tool to verify which front sensor has failed (left or right)
4. Loosen wheel lug nuts while vehicle is on the ground

Procedure

1. 1

   Raise and support vehicle
   Raise the front of the vehicle using a floor jack at the front differential or frame rail. Support with jack stands under the frame rails. Remove the wheel completely to access the sensor.
2. 2

   Locate the wheel speed sensor
   The front wheel speed sensor is mounted on the steering knuckle behind the brake rotor. Look for a single 10mm bolt securing the sensor with a wire connector extending upward toward the wheel well. On the JK Wrangler, the sensor is positioned at approximately the 6 o'clock position on the knuckle.
3. 3

   Disconnect sensor electrical connector
   Follow the sensor wire harness upward along the brake line toward the inner fender well. Locate the connector approximately 12-18 inches from the sensor. Press the connector release tab and pull the connector apart. If the connector is corroded or stuck, apply penetrating oil and carefully work it free without damaging the locking tab.
   ⚠Do not pull on the sensor wire itself - always grip the connector body to avoid damaging internal wires
4. 4

   Remove wire harness routing clips
   The sensor wire is retained by one or two plastic clips along the brake line or on the upper control arm. Use a flathead screwdriver or pick to carefully release these clips. Note the routing path for reinstallation - the wire must not contact the tire, suspension components, or brake rotor during wheel travel.
5. 5

   Remove sensor mounting bolt
   Using a 10mm socket with extension, remove the single bolt securing the sensor to the steering knuckle. The bolt may be corroded due to road salt and brake dust exposure. If stuck, apply penetrating oil and allow it to soak for 5-10 minutes before attempting removal. The bolt threads into the aluminum knuckle, so avoid cross-threading or stripping.
   ⚠Apply penetrating oil to corroded bolts and work carefully - replacement mounting bolts can be difficult to source separately
   Torque spec

   Mounting Bolts31 Nm (23 lb-ft)
6. 6

   Extract sensor from knuckle
   Carefully pull the sensor straight out of its mounting bore in the knuckle. If the sensor is seized due to corrosion, gently twist while pulling. Avoid prying against the sensor body as this can crack the plastic housing. If severely stuck, apply penetrating oil around the sensor body and allow to soak, then use light tapping on the sensor rear while pulling.
7. 7

   Clean sensor mounting bore
   Use a wire brush to clean the sensor mounting hole in the steering knuckle, removing any corrosion, brake dust, or debris. The bore must be clean to ensure proper sensor depth and prevent future seizing. Inspect the O-ring groove if visible. Wipe clean with a lint-free cloth.
8. 8

   Install new wheel speed sensor
   Inspect the new sensor for damage and verify the correct part number. Check that the O-ring is properly seated on the sensor body. Apply a thin coating of dielectric grease to the sensor O-ring to aid installation and future removal. Insert the sensor straight into the knuckle bore until it seats completely - the mounting hole should align perfectly when fully seated.
   ⚠Do not allow the magnetic sensor tip to contact metal debris or filings during installation
9. 9

   Install and torque sensor mounting bolt
   Thread the mounting bolt by hand to ensure proper thread engagement. Torque the bolt to 31 Nm (23 lb-ft) using a torque wrench. Do not overtighten as this can crack the sensor housing or strip the aluminum knuckle threads.
   Torque spec

   Mounting Bolts31 Nm (23 lb-ft)
10. 10

    Route and secure sensor wire harness
    Route the sensor wire along the original path, ensuring it follows the brake line and does not contact moving suspension components. Secure all routing clips firmly. Verify the wire has adequate slack for full steering travel and suspension compression without pulling tight or chafing.
11. 11

    Connect electrical connector
    Clean both halves of the electrical connector with electrical contact cleaner if corrosion is present. Apply a small amount of dielectric grease to the connector terminals. Push the connector together firmly until the locking tab clicks into place. Gently tug on both sides to verify the connection is secure.
12. 12

    Reinstall wheel and lower vehicle
    Reinstall the wheel and thread all lug nuts by hand. Lower the vehicle until the tire just contacts the ground. Torque the lug nuts to 156 Nm (115 lb-ft) in a star pattern. Fully lower the vehicle and remove jack stands.
    Torque spec

    Wheel Lug Nuts156 Nm (115 lb-ft)

Reassembly

1. Ensure the sensor wire harness is properly routed and secured with all clips engaged
2. Verify the electrical connector is fully locked and cannot be pulled apart easily
3. Confirm the sensor mounting bolt is torqued to specification and the sensor sits flush in the knuckle bore

Verification

• Start the vehicle and verify the ABS warning light follows the normal start sequence (illuminates briefly then extinguishes)
• If the ABS light remains on, use a scan tool to check for stored fault codes - the new sensor may require a brief drive cycle to initialize
• Test drive the vehicle at speeds above 15 mph and verify the ABS light does not illuminate
• Perform a controlled ABS stop in a safe area to confirm proper system operation
• Re-scan for codes after test drive to confirm the fault has cleared

More procedures for this vehicle