how to fix the C1234 code on my Honda Civic 11th Generation (2022-Present)

Learn how to diagnose and fix C1234 code related to wheel speed sensor issues in Honda Civic 11th Generation. Step-by-step guide included.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical short circuits.

2. Inspect and Repair Wiring

• Inspect Wiring:

  • Visually check the wiring harness leading to the left front wheel speed sensor for frays or breaks.
  • If damaged, repair or replace the wiring as necessary.

• Repair Connector:

  • Disconnect the sensor connector. Clean the terminals with electrical contact cleaner.
  • If the connector is damaged, replace it with a new connector.

3. Replace Wheel Speed Sensor

• Remove Wheel:

  • Lift the front of the vehicle and securely support it with jack stands.
  • Remove the left front wheel using a socket set.

• Remove Old Sensor:

  • Locate the wheel speed sensor mounted near the brake rotor.
  • Remove the mounting bolt securing the sensor using the appropriate socket.
  • Carefully pull the sensor from its housing.

• Install New Sensor:

  • Insert the new wheel speed sensor into the housing.
  • Secure it with the mounting bolt to the specified torque (typically around 7-10 ft-lbs).

• Reconnect Wiring:

  • Reconnect the sensor connector ensuring it clicks into place securely.

4. Reassembly and Reset

• Reinstall the left front wheel and lower the vehicle.
• Reconnect the negative battery terminal.
• Clear the C1234 code using the OBD-II scanner.