how to fix P0420 code on Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Temperature probe
• Safety glasses
• Gloves

2. Inspect and Replace Oxygen Sensors

1. Locate the pre-catalytic and post-catalytic oxygen sensors.
2. Disconnect the electrical connectors from both oxygen sensors.
3. Use a socket wrench to remove the oxygen sensors from their respective locations.
4. Install the new oxygen sensors, ensuring they are properly seated.
5. Torque the oxygen sensors to the manufacturer’s specifications (typically around 30 lb-ft).

3. Inspect and Replace Catalytic Converter (if necessary)

1. If the catalytic converter is damaged or performance is still poor, it may require replacement.
2. Raise the vehicle using a jack and secure with jack stands.
3. Remove the exhaust pipes connected to the catalytic converter using a socket set.
4. Unbolt the catalytic converter from its mounting points and remove it from the exhaust system.
5. Install the new catalytic converter, ensuring proper alignment.
6. Reinstall the exhaust pipes and torque all bolts to the manufacturer's specifications.

4. Reconnect Battery and Clear Codes

1. Reconnect the battery terminals.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle’s memory.