how to fix C0121 code on my Renault Clio V (2019-Present)

Learn how to diagnose and fix C0121 ABS issue in Renault Clio V (2019-Present). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the battery to prevent 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 using a soft brush or cloth.
• Disconnect the electrical connectors from the sensors.
• Inspect the connectors for corrosion or damage and clean if necessary.

3. Replace Wheel Speed Sensors (if faulty)

• If any sensor tests show resistance outside the specified range, replace it:
  • Remove the wheel associated with the faulty sensor.
  • Unbolt the sensor from the hub assembly.
  • Install the new sensor in reverse order, ensuring it is secured and properly aligned.
  • Reconnect the electrical connector.

4. Check ABS Module

• Inspect the ABS module connections for corrosion or loose wiring.
• If corrosion is present, clean the terminals with electrical contact cleaner.
• Reconnect all wiring securely.

5. Reconnect Battery and Clear Codes

• Reconnect the vehicle's battery.
• Use the OBD-II scanner to clear the C0121 code and any other stored codes.
• Start the vehicle and check if the ABS and traction control lights are still illuminated.