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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the vehicle to cool down if it has been running.

2. Inspect and Replace Oxygen Sensors

• Locate the upstream and downstream oxygen sensors on the exhaust system.
• Use an O2 sensor socket to remove the upstream sensor.
• Install the new upstream oxygen sensor, tightening it to the manufacturer’s specified torque (typically 30 lb-ft).
• Repeat the process for the downstream sensor if it shows signs of malfunction.

3. Inspect and Replace Catalytic Converter

• If the catalytic converter is damaged or blocked, proceed to replace it.
• Remove the exhaust pipe sections connected to the catalytic converter, using a socket set to loosen the bolts.
• Carefully remove the old catalytic converter.
• Install the new catalytic converter, ensuring all connections are secure and aligned properly.
• Torque the bolts to the manufacturer’s specifications (consult service manual for exact values).

4. Reconnect Battery and Clear Codes

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