how to fix the C1234 error code on my Tesla Model 3 Original (2017-2023)

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, socket set, and a torque wrench.
• Ensure the vehicle is parked on a level surface, and the ignition is off.

2. Access Wheel Speed Sensors

• Sub-steps:
  1. Lift the vehicle using a jack and secure it with jack stands.
  2. Remove the wheel where the wheel speed sensor needs to be inspected (if necessary).
  3. Locate the wheel speed sensor on the hub assembly.

3. Inspect and Replace Wheel Speed Sensor

• Sub-steps:
  1. Disconnect the wiring harness from the wheel speed sensor.
  2. Remove the sensor by unscrewing it from the hub assembly.
  3. Install the new wheel speed sensor by reversing the removal steps, ensuring it is properly seated.
  4. Reconnect the wiring harness securely.
  5. Repeat for other wheels if necessary, especially if multiple sensors are affected.

4. Clear Error Codes

• Sub-steps:
  1. Reconnect the battery if it was disconnected during repairs.
  2. Use the OBD-II scanner to clear the C1234 error code from the system.
  3. Perform a systems check to ensure that no new codes appear.