how to fix C1231 error code on my Toyota Corolla E210 (2019-2024)

Learn how to diagnose and fix C1231 ABS sensor issues in Toyota Corolla E210 (2019-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Inspect and Clean ABS Sensors

• Locate the ABS wheel speed sensors at each wheel hub.
• Remove any dirt or debris around the sensor area to ensure proper function.
• If any sensors are damaged, replace them.

3. Repair Wiring and Connections

• Visually inspect the wiring harnesses and connectors for signs of wear or damage.
• Repair any frayed or broken wires, and ensure all connections are clean and tight.
• Use dielectric grease on electrical connectors to prevent corrosion.

4. Replace Faulty Wheel Speed Sensors (if necessary)

• If testing shows a wheel speed sensor is out of specification, remove the sensor:
  • Remove the mounting bolt using a socket set.
  • Carefully pull the sensor out of the hub assembly.
• Install the new sensor:
  • Lubricate the O-ring of the new sensor with a small amount of brake grease.
  • Insert the new sensor into the hub assembly and secure it with the mounting bolt to the specified torque.

5. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the vehicle and check for any warning lights.
• Perform a test drive to ensure the ABS system is functioning correctly and the C1231 code does not reappear.