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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is off.
• Disconnect the battery to prevent any electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream oxygen sensor:
   • Locate the oxygen sensor before the catalytic converter.
   • Use an oxygen sensor socket to unscrew the sensor from the exhaust manifold.
2. Install the new upstream oxygen sensor:
   • Apply anti-seize compound to the threads of the new sensor.
   • Screw it into place and tighten to the manufacturer's specified torque (typically around 30 Nm).
3. Repeat for the downstream oxygen sensor:
   • Locate the oxygen sensor after the catalytic converter.
   • Remove and replace it following the same steps as the upstream sensor.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove the catalytic converter:
   • Disconnect any heat shields and exhaust clamps.
   • Detach the catalytic converter from the exhaust pipes and manifold using appropriate wrenches.
2. Inspect the old catalytic converter:
   • Check for signs of physical damage or a clogged substrate.
3. Install the new catalytic converter:
   • Position the new unit in place and secure it with bolts and exhaust clamps.
   • Ensure all connections are tight and leak-free.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code and any other related codes.