my Renault Clio V (2019-Present) has a check engine code P0420 how to fix

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the vehicle battery to ensure safety.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors (if faulty)

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors attached to the exhaust system.
  2. Use the O2 sensor socket to remove the faulty sensor.
  3. Install the new oxygen sensor and torque it to the manufacturer’s specifications (usually around 30 lb-ft).
  4. Reconnect the vehicle battery.

3. Inspect and Replace Catalytic Converter (if faulty)

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool
• Sub-steps:
  1. Remove the exhaust pipe connected to the catalytic converter by loosening the bolts with a socket set.
  2. Support the catalytic converter with a jack to prevent it from falling.
  3. Remove any brackets or hangers securing the catalytic converter.
  4. Replace the old catalytic converter with a new one, ensuring proper alignment.
  5. Tighten all bolts to the manufacturer's torque specifications.

4. Clear Codes and Test Drive

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Use the OBD-II scanner to clear the P0420 code from the vehicle's system.
  2. Start the engine and allow it to reach operating temperature.
  3. Take the vehicle for a test drive to ensure the check engine light does not reappear.