how to diagnose C1234 code in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is on a level surface and the ignition is off.
• Disconnect the negative battery terminal to prevent any electrical shorts.

2. Inspect and Clean Wheel Speed Sensors

• Locate the wheel speed sensors at each wheel hub.
• Remove any dirt or debris around the sensors.
• Clean the sensor and the mounting area using a suitable cleaning solution and soft cloth.

3. Check Wiring and Connectors

• Visually inspect the wiring harness and connectors for each ABS sensor.
• Repair any damaged wires or connectors identified during the inspection.
• Re-secure any loose connections to ensure tight contact.

4. Test and Replace Wheel Speed Sensors (if necessary)

• Use a multimeter to measure the resistance of each wheel speed sensor. The typical range should be between 1,000 to 1,500 ohms.
• If any sensor is outside this range, proceed to replace it:
  • Remove the old sensor by unscrewing it from its mounting point.
  • Install the new sensor, ensuring it is securely fastened and properly aligned.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the C1234 code and any other related codes.
• Start the vehicle and check if the ABS and traction control lights are off.