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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, jack and jack stands, safety goggles, gloves.
• Allow the engine to cool completely before starting work.

2. Inspect and Replace O2 Sensors

1. Locate O2 Sensors:
   • Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) O2 sensors.
2. Disconnect Battery:
   • Disconnect the negative terminal of the battery to ensure safety.
3. Remove O2 Sensors:
   • Use a socket or O2 sensor wrench to unscrew the sensors from their respective locations.
4. Install New O2 Sensors:
   • Apply anti-seize compound on the threads of the new sensors (if applicable) and install them, tightening to manufacturer specifications (usually around 30-40 Nm).
5. Reconnect Battery:
   • Reconnect the negative terminal of the battery.

3. Inspect and Replace Catalytic Converter

1. Lift Vehicle:
   • Use a jack and jack stands to lift the vehicle safely.
2. Remove Exhaust Components:
   • Unbolt the exhaust pipe sections leading to the catalytic converter using a socket set.
3. Inspect Catalytic Converter:
   • Check for any signs of physical damage or clogging. If damaged, proceed to replace it.
4. Install New Catalytic Converter:
   • Place the new catalytic converter in position and reattach the exhaust sections, tightening bolts to the specified torque (usually around 25-30 Nm).
5. Lower Vehicle:
   • Safely lower the vehicle back to the ground.