how to fix C1231 error code on Honda Accord 8th Generation (2008-2012)?

Learn how to diagnose and fix C1231 error code related to the right rear wheel speed sensor in Honda Accord 8th Generation. Step-by-step guide included.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the vehicle to cool if it has been recently driven.

2. Inspect and Replace Right Rear Wheel Speed Sensor

1. Locate the Sensor

   • Position the vehicle securely on jack stands.
   • Remove the right rear wheel to access the wheel speed sensor.

2. Remove the Wheel Speed Sensor

   • Disconnect the electrical connector from the wheel speed sensor.
   • Remove the retaining bolt(s) securing the sensor to the brake assembly using a socket set.
   • Gently pull the sensor from its mounting location.

3. Install the New Sensor

   • Apply a small amount of anti-seize compound to the threads of the new sensor if required.
   • Insert the new sensor into the mounting location and secure it with the retaining bolt(s).
   • Reconnect the electrical connector to the new sensor.

3. Check Wiring and Connectors

1. Inspect Wiring

   • Visually inspect the wiring harness leading to the wheel speed sensor for any signs of wear, fraying, or damage.
   • Repair or replace any damaged wiring as necessary.

2. Recheck Electrical Connections

   • Ensure all connectors are clean and properly seated. Use electrical contact cleaner if needed.

4. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the vehicle and allow it to run for a few minutes.