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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Ensure the vehicle is on a flat surface and secure with wheel chocks.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench, penetrating oil.
  1. Locate the upstream and downstream oxygen sensors.
  2. Apply penetrating oil to the sensor threads to ease removal.
  3. Disconnect the wiring harness from each sensor.
  4. Use the O2 sensor socket to remove the sensors from the exhaust system.
  5. Install new oxygen sensors and torque to manufacturer specifications (usually around 30-40 Nm).
  6. Reconnect the wiring harnesses.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust hangers removal tool.
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Remove any exhaust hangers securing the catalytic converter for easier access.
  3. Unbolt the catalytic converter from the exhaust manifold and the exhaust pipe.
  4. Inspect the old catalytic converter for physical damage or excessive contamination.
  5. Install the new catalytic converter, ensuring proper alignment.
  6. Torque the bolts to manufacturer specifications (usually around 20-30 Nm).
  7. Reinstall exhaust hangers securely.

4. Clear Error Codes

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