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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface with the engine off and cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Clean

• Tools Needed: Socket set, wire brush, cleaning solvent.
• Check for any carbon buildup on the exhaust components.
• Use a wire brush and cleaning solvent to clean any debris from the catalytic converter (if applicable).

3. Replace O2 Sensors (if faulty)

• Tools Needed: O2 sensor socket, wrench, torque wrench.
• Remove the upstream and downstream O2 sensors using an O2 sensor socket.
• Install the new O2 sensors, ensuring they are torqued to the manufacturer’s specifications (typically around 30 lb-ft).
• Reconnect the electrical connectors securely.

4. Replace Catalytic Converter (if necessary)

• Tools Needed: Socket set, torque wrench, exhaust gasket.
• Remove the bolts securing the catalytic converter to the exhaust system.
• Carefully detach the catalytic converter from its mounts.
• Install the new catalytic converter, using a new gasket and ensuring it is properly aligned.
• Torque the bolts to manufacturer specifications (usually 30-40 lb-ft).

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code from the system.