what does it mean if my Toyota Highlander has a C1231 code?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect and Clean Wheel Speed Sensors

• Tools Required: Socket set, cleaning brush, electrical contact cleaner.
• Remove the wheel(s) to gain access to the wheel speed sensors.
• Clean the sensors and the area around them with electrical contact cleaner.
• Inspect the sensors for any signs of damage or debris that could affect performance.

3. Check Wiring and Connectors

• Tools Required: Multimeter, wire brush.
• Inspect the wiring harness and connectors leading to the wheel speed sensors.
• Use a multimeter to check for continuity in the wiring and look for any shorts or breaks.
• Clean any corrosion found on connectors with a wire brush and electrical contact cleaner.

4. Replace Wheel Speed Sensor (if necessary)

• Tools Required: Socket set, torque wrench.
• If the sensor is damaged or out of specification, remove the old wheel speed sensor by unscrewing it from its mounting point.
• Install the new wheel speed sensor and torque it to the manufacturer's specifications (typically around 7-10 ft-lbs).
• Reconnect the electrical connector securely.