how to fix the P0420 code on my Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the exhaust system to cool before working on it.

2. Inspect O2 Sensors

• Tools Required: OBD-II scanner, multimeter.
• Remove the upstream and downstream oxygen sensors using a socket wrench.
• Inspect the wiring and connectors for damage or corrosion.
• Test the sensors with a multimeter to ensure they are operating correctly. Replace any faulty sensors.

3. Check Exhaust System

• Tools Required: Jack stands, socket set.
• Lift the vehicle securely using jack stands.
• Inspect the entire exhaust system for leaks, holes, or damage.
• Repair or replace any damaged components in the exhaust system.

4. Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, exhaust gasket, torque wrench.
• Remove the catalytic converter from the exhaust system by unbolting it from the exhaust pipes.
• Install the new catalytic converter, ensuring that the exhaust gasket is in place.
• Torque the bolts to the manufacturer’s specifications.

5. Reconnect Battery and Clear Codes

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