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

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, ratchet, torque wrench.

• Remove the upstream oxygen sensor:

  1. Locate the sensor on the exhaust manifold or pipe.
  2. Use the O2 sensor socket to unscrew and remove the sensor.

• Install the new sensor:

  1. Apply anti-seize compound to the threads of the new sensor.
  2. Hand-tighten the sensor before using the torque wrench to tighten to manufacturer's specifications (usually around 30 Nm).

• Repeat the process for the downstream oxygen sensor if necessary.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust pipe cutter (if required).
• Remove the catalytic converter:
  1. Disconnect any heat shields or mounting brackets.
  2. Use the socket set to remove bolts securing the catalytic converter to the exhaust system.
  3. If the converter is welded, use an exhaust pipe cutter to carefully cut it out.
• Install the new catalytic converter:
  1. Position the new converter in place and secure it with the bolts.
  2. Tighten the bolts to the manufacturer's specifications (usually around 25-35 Nm).

4. Check for Exhaust Leaks

• After installation, start the vehicle and inspect the exhaust system for any leaks using a smoke test or by listening for abnormal sounds.

5. Clear the Codes

• Reconnect the battery and use the OBD-II scanner to clear the P0420 code.