how to fix P0420 code on my Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Safety glasses and gloves should be worn.

2. Inspect and Replace Oxygen Sensors

• Locate the upstream and downstream oxygen sensors near the catalytic converter.
• Use a wrench or O2 sensor socket to carefully remove the sensors.
• Inspect the wiring for damage or corrosion.
• Install new oxygen sensors and tighten to the manufacturer’s torque specification (usually around 30-35 ft-lbs).
• Reconnect the battery.

3. Examine and Replace the Catalytic Converter

• Raise the vehicle securely on jack stands.
• Remove any heat shields covering the catalytic converter.
• Unbolt the catalytic converter from the exhaust system using a socket set (typically 15-18 ft-lbs torque).
• Inspect for any internal damage or blockage if applicable.
• Install the new catalytic converter, ensuring proper alignment and securing with new gaskets if necessary.
• Torque bolts to manufacturer specifications.

4. Clear the Codes

• Reconnect the battery and use the OBD-II scanner to clear the P0420 code from the memory.
• Start the engine and allow it to reach operating temperature to ensure no further codes are present.