2013-2022 Acura ILX Rear ABS Wheel Speed Sensor: A Buyer's and DIY Guide

Symptoms of a Failing Acura ILX ABS Sensor

When a rear wheel speed sensor begins to fail on the Acura ILX, it typically triggers a number of clear warning signs. Because the sensor provides data to multiple safety systems, a failure will cause several dashboard lights to illuminate at once.

• ABS, VSA, and Brake System Lights: The most common symptom is the illumination of the ABS (Anti-lock Braking System), VSA (Vehicle Stability Assist), and sometimes the general brake warning light on your dashboard. These systems are disabled as a safety precaution when they can no longer get a reliable speed reading from one of the wheels.
• Disabled Driver Assists: On newer ILX models, you may also see warnings for other disabled features like Hill Start Assist or Forward Collision Warning, as these systems also rely on wheel speed data to function correctly.
• Unusual Braking Behavior: In some cases, you might feel a pulsing or vibration in the brake pedal during normal, light braking as the ABS system incorrectly activates. You may also experience increased stopping distances during hard braking because the anti-lock function is not working.
• Loss of Traction Control: You may notice the wheels spin more easily when accelerating on wet or loose surfaces, as the traction control system is no longer able to intervene.

Known Issues, Recalls, and Service Bulletins for 2013-2022 Acura ILX

While the search results show several recalls for the 2013-2022 Acura ILX, including for airbags, headlights, and driveshafts, there are no specific recalls or Technical Service Bulletins (TSBs) directly related to the failure of the ABS wheel speed sensors themselves. However, it is a known issue that a failure of a single wheel speed sensor can cause a cascade of warning lights, including 'Check VSA System,' 'Check Power Steering System,' and 'Uphill Assist,' which can sometimes be misdiagnosed as a failure of the more expensive ABS/VSA control module. It is always recommended to diagnose the individual sensors before concluding the entire module needs replacement.

Buying a Used ABS Wheel Speed Sensor for Your ILX

Purchasing a used OEM ABS wheel speed sensor can be a cost-effective solution. Since these are electronic components, a careful inspection is key to ensuring you get a reliable part.

Physical Inspection Checklist

• Inspect the Wiring: Check the entire length of the wire harness for any cuts, fraying, or signs of melting. The insulation should be flexible and free of cracks.
• Examine the Connector: The plastic connector at the end of the harness should be intact, with no broken clips or visible corrosion on the metal pins inside.
• Check the Sensor Head: The sensor itself (the part that mounts near the wheel hub) should be free of cracks, heavy corrosion, or physical damage.
• Verify the Part Number: Double-check that the part number stamped on the sensor or its packaging matches the specific side (Left or Right) you need for your ILX.

Why a Used OEM Sensor is Often a Smart Choice

While new aftermarket sensors are available, a used OEM (Original Equipment Manufacturer) sensor offers the benefit of perfect fitment and compatibility with your vehicle's systems. OEM sensors are designed and tested by Acura to meet precise specifications for signal accuracy and durability, which is crucial for safety systems like ABS and VSA. A quality used OEM part from a low-mileage vehicle can provide the same reliability as a new part for a fraction of the cost.

Cost Comparison: New, Used, and Aftermarket

Here is an estimated cost breakdown for replacing a single rear ABS wheel speed sensor on a 2013-2022 Acura ILX.

Replacing the Rear ABS Wheel Speed Sensor (DIY Guide)

Replacing the rear ABS sensor on an ILX is a straightforward job for a DIY mechanic with basic tools. The process involves removing the wheel, unbolting the sensor, and disconnecting its electrical plug.

Difficulty and Time

• Difficulty: 2/5
• Estimated Time: 0.5 - 1 hour per side

Required Tools

• Jack and Jack Stands
• Lug Wrench
• Ratchet and Socket Set (typically 10mm)
• Needle-nose pliers (for clips)
• Torque Wrench
🎬 See how to replace the sensor using basic hand tools

Step-by-Step Instructions

1. Safety First: Park on a level surface, engage the parking brake, and disconnect the negative battery terminal.
2. Raise the Vehicle: Loosen the lug nuts on the wheel you are working on, then use a jack to raise the vehicle and secure it with a jack stand. Never work under a vehicle supported only by a jack.
3. Remove the Wheel: Finish removing the lug nuts and take off the wheel.
4. Locate the Sensor: The ABS sensor is mounted on the back of the wheel hub/knuckle assembly. It is a small plastic sensor held in by a single 10mm bolt. Follow the wire from the sensor to locate its mounting points.
5. Remove the Sensor and Harness: Unscrew the 10mm bolt holding the sensor in place. Gently wiggle and pull the sensor out of the hub. It may be stuck with rust or grime, so be patient. Unclip the wire harness from any attachment points along the suspension and frame.
6. Disconnect the Connector: Follow the wire into the wheel well or under the vehicle to find the electrical connector. You may need to remove a plastic splash shield to access it. Disconnect the old sensor.
7. Install the New Sensor: Compare the new sensor to the old one to ensure they match. Connect the new sensor's electrical plug. Route the wire and secure it to the factory clip locations. Insert the new sensor into the hub and tighten the 10mm retaining bolt. Be careful not to overtighten.
8. Reassemble: Reinstall the wheel and torque the lug nuts to the manufacturer's specification. Lower the vehicle.
9. Final Steps: Reconnect the negative battery terminal. Start the car. The ABS and VSA lights should turn off after driving a short distance. If they remain on, you may need a scan tool to clear the stored fault codes.

Frequently Asked Questions (FAQ)