how to fix P0420 code on my Honda CR-V Sixth Generation (2023-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, penetrating oil
• Remove the pre-catalytic and post-catalytic oxygen sensors by applying penetrating oil to the threads and using the O2 sensor socket.
• Inspect the sensors for damage or contamination and replace them if necessary.
• Install the new sensors and torque them to the manufacturer's specifications (usually around 30 lb-ft).

3. Check and Replace the Catalytic Converter

• Tools Required: Jack and jack stands, socket set, exhaust system hanger removal tool
• Lift the vehicle and secure it on jack stands.
• Remove the exhaust system hangers and bolts securing the catalytic converter to the exhaust system.
• Inspect the catalytic converter for any physical damage or blockage. If damaged, remove the old converter and install the new one, ensuring proper alignment.
• Torque all bolts to manufacturer specifications.

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.