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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Allow the engine to cool completely before working on the exhaust system.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream and downstream oxygen sensors from the exhaust system.
• Inspect the sensors for damage or contamination.
• If faulty, replace with new OEM or high-quality aftermarket sensors.
• Torque the new sensors to the manufacturer’s specifications (typically 30-40 lb-ft).

3. Inspect and Replace the Catalytic Converter

• Tools Required: Wrench set, socket set, exhaust gasket scraper, torque wrench.
• Remove any exhaust hangers or brackets securing the catalytic converter.
• Unbolt the catalytic converter from the exhaust manifold and the mid-pipe.
• Inspect the old catalytic converter for damage, clogging, or disintegration.
• Install the new catalytic converter with new exhaust gaskets.
• Torque the bolts to the specified values (consult service manual for exact numbers).

4. Reset the Engine Control Module (ECM)

• Reconnect the battery terminals.
• Use an OBD-II scanner to clear the P0420 code from the ECM.
• Start the engine and allow it to reach operating temperature.