how to fix P0420 code in Renault Clio V (2019-Present)

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors (if faulty)

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Sub-steps:
  1. Locate the pre-catalytic and post-catalytic oxygen sensors.
  2. Use the O2 sensor socket to remove the faulty sensor.
  3. Apply anti-seize compound to the threads of the new sensor.
  4. Install the new sensor and tighten it to the manufacturer's specifications (usually around 30 Nm).
  5. Reconnect the sensor's electrical connector.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust pipe cutter (if needed).
• Sub-steps:
  1. Remove the exhaust system components connected to the catalytic converter using the socket set.
  2. If the catalytic converter is damaged or blocked, remove it from the exhaust system.
  3. Install the new catalytic converter, ensuring proper fitment and alignment.
  4. Tighten all bolts to the manufacturer's specifications (typically around 40 Nm).
  5. Reinstall any removed exhaust components.

4. Clear Error Codes

• Reconnect the battery.
• Use an OBD-II scanner to clear the P0420 code from the system.