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

Solution

1. Preparation

• Gather the required tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to avoid electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, penetrating oil.
• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Spray penetrating oil on the O2 sensor threads to ease removal.
  3. Disconnect the electrical connectors from both sensors.
  4. Using the O2 sensor socket, remove both sensors from the exhaust pipe.
  5. Install new sensors by screwing them in hand-tight, then torque to manufacturer specifications (typically around 30-40 lb-ft).
  6. Reconnect the electrical connectors.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool.
• Sub-steps:
  1. Remove the exhaust hangers using the exhaust hanger removal tool to lower the exhaust system for better access.
  2. Disconnect the exhaust pipes from the catalytic converter by removing the bolts.
  3. Remove any brackets or additional supports holding the catalytic converter in place.
  4. Carefully remove the old catalytic converter from the vehicle.
  5. Install the new catalytic converter, ensuring proper alignment with exhaust pipes.
  6. Reattach any brackets and exhaust hangers, torque bolts to manufacturer specifications.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.