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

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Replace Faulty Components

• Oxygen Sensors

  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use an O2 sensor socket to remove the faulty sensor.
  4. Install the new sensor and reconnect the electrical connector.

• Catalytic Converter

  1. Inspect the exhaust system and locate the catalytic converter.
  2. If the converter is damaged or clogged, remove it by unbolting the flanges and disconnecting any hangers.
  3. Install the new catalytic converter, ensuring proper alignment.
  4. Torque bolts to manufacturer specifications (typically around 30-40 lb-ft).

3. Reassemble and Clear Codes

1. Reconnect the battery terminals.
2. Start the engine and allow it to reach operating temperature.
3. Use the OBD-II scanner to clear the P0420 code from the system.