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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on the vehicle.
• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, exhaust jack.

2. Replace Oxygen Sensors (if faulty)

• Step 1: Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
• Step 2: Disconnect the electrical connectors from both sensors.
• Step 3: Use the socket set to remove the sensors from the exhaust manifold and catalytic converter.
• Step 4: Install the new oxygen sensors by hand to avoid cross-threading, then tighten them to the manufacturer's specified torque (typically around 30 Nm).
• Step 5: Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Step 1: Raise the vehicle using an exhaust jack and secure it with jack stands.
• Step 2: Disconnect the exhaust pipes from the catalytic converter by removing the bolts and brackets.
• Step 3: Remove any hangers or clamps securing the catalytic converter.
• Step 4: Remove the catalytic converter from the vehicle.
• Step 5: Install the new catalytic converter by reversing the removal steps, ensuring to tighten all bolts to the specified torque (usually around 25 Nm).
• Step 6: Reconnect any exhaust pipes and hangers.

4. Reset the OBD-II System

• Step 1: Reconnect the battery.
• Step 2: Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.