what does the code P0420 mean for my Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Remove the oxygen sensor located before the catalytic converter using an oxygen sensor socket.
   • Tools Required: Oxygen sensor socket, ratchet, and extension.
2. Inspect the sensor for contamination or damage; replace if necessary.
3. Repeat the process for the oxygen sensor located after the catalytic converter.

3. Inspect and Replace the Catalytic Converter

1. Remove the exhaust pipe connected to the catalytic converter:
   • Unbolt the flange connections and remove any heat shields.
   • Tools Required: Socket set, wrench set.
2. Inspect the catalytic converter for signs of damage, such as dents or corrosion.
3. If needed, replace the catalytic converter:
   • Install the new catalytic converter in the same orientation as the old one.
   • Torque the bolts to the manufacturer's specifications (typically around 30-40 ft-lbs).
   • Reinstall any heat shields and the exhaust pipe.

4. Reset the OBD-II System

1. Reconnect the negative battery terminal.
2. Use an OBD-II scanner to clear the P0420 code from the system.