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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the battery to prevent any electrical issues.

2. Inspect and Replace Oxygen Sensors

1. Locate the oxygen sensors: Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Disconnect the sensors: Unplug the electrical connectors from both sensors.
3. Remove the sensors: Use an oxygen sensor socket to carefully unscrew the sensors from the exhaust system.
4. Install new sensors: Apply anti-seize compound to the threads of the new oxygen sensors. Install them in the same location and torque to manufacturer specifications.
5. Reconnect electrical connectors: Ensure that connectors are securely attached to the new sensors.

3. Inspect and Replace Catalytic Converter

1. Remove exhaust components: If necessary, unbolt the exhaust pipe sections to access the catalytic converter.
2. Inspect the catalytic converter: Check for physical damage, such as dents or rust.
3. Replace the catalytic converter: If damaged, install a new catalytic converter according to manufacturer specifications. Ensure all gaskets are replaced to avoid leaks.
4. Reassemble exhaust components: Torque all bolts to the manufacturer's specifications.

4. Clear Error Codes

1. Reconnect the battery: Reattach the negative terminal.
2. Use the OBD-II scanner: Clear the P0420 code from the vehicle's computer.