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C1142 Wheel Speed Sensor RF Tone Ring Tooth Missing Fault

The OBD2 code C1142 indicates that the right front wheel speed sensor is detecting a missing tooth on the tone ring, which can affect the accuracy of wheel speed readings and potentially impact traction control and...

Definition

The OBD2 code C1142 indicates that the right front wheel speed sensor is detecting a missing tooth on the tone ring, which can affect the accuracy of wheel speed readings and potentially impact traction control and anti-lock braking system performance

Common causes

  • Damaged or missing tone ring
  • Misalignment of the tone ring
  • Faulty wheel speed sensor
  • Wiring issues (shorts, opens, or corrosion)
  • Dirt or debris on the tone ring or sensor
  • Improper installation of the tone ring or sensor
  • Brake rotor or hub assembly issues

Common misdiagnoses

  • Faulty wheel speed sensor
  • Damaged tone ring
  • ABS control module failure
  • Wiring issues or shorts
  • Brake system problems
  • Incorrect tire size or pressure
  • Faulty hub assembly
  • Misalignment of wheel components

Troubleshooting steps

  1. 1. Visual Inspection

    Check the Tone Ring: Inspect the right front wheel speed sensor tone ring for any visible damage, such as missing teeth or cracks

  2. 2. Sensor Condition

    Examine the wheel speed sensor for any signs of damage, corrosion, or dirt buildup that could affect its operation

  3. 3. Wiring and Connectors

    Inspect the wiring harness and connectors leading to the wheel speed sensor for any signs of wear, fraying, or disconnection

  4. 4. Clean the Sensor and Tone Ring

    If dirt or debris is present, clean the wheel speed sensor and tone ring with a suitable cleaner. Ensure that no contaminants are left that could interfere with the sensor's operation

  5. 5. Check Sensor Alignment

    Ensure that the wheel speed sensor is properly aligned with the tone ring. Misalignment can lead to incorrect readings

  6. 6. Test the Wheel Speed Sensor

    Use a multimeter to check the resistance of the wheel speed sensor. Compare the readings to the manufacturer's specifications

  7. 7. If available, use a scan tool to monitor the wheel speed sensor's output while the vehicle is in motion. The readings should change as the wheel rotates

  8. 8. Inspect the ABS Module

    If the sensor and tone ring are in good condition, check the ABS control module for any faults. Ensure that it is receiving the correct signals from the wheel speed sensor

  9. 9. Check for Other Codes

    Scan for any additional trouble codes that may provide more context or indicate related issues. Address any other codes before focusing solely on C1142

  10. 10. Perform a System Reset

    After addressing any issues found, clear the trouble codes using a scan tool and take the vehicle for a test drive to see if the code returns

  11. 11. Replace Components if Necessary

    If the tone ring is damaged or missing teeth, it will need to be replaced. Similarly, if the wheel speed sensor is faulty, it should be replaced as well

  12. 12. Professional Diagnosis

    If the issue persists after performing these steps, consider seeking help from a professional mechanic or technician who has experience with ABS and wheel speed sensor issues. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1142 code