Honda Pilot Third Generation (2016-present) P0420 code what does it mean

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, infrared thermometer, jack and jack stands.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent any electrical issues during repair.

2. Inspect and Replace Oxygen Sensors

1. Locate the oxygen sensors: Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Remove the sensors: Use a socket wrench to carefully unscrew the sensors from the exhaust system.
3. Test sensors: Check the resistance and output voltage of the sensors with a multimeter. Replace if faulty.
4. Install new sensors: Apply anti-seize compound to the threads of the new sensors and install them securely.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove exhaust components: Use a socket set to detach any bolts or clamps connecting the catalytic converter to the exhaust system.
2. Remove the catalytic converter: Carefully lower the catalytic converter, ensuring no damage to surrounding components.
3. Inspect the new catalytic converter: Ensure it matches the specifications required for the Honda Pilot.
4. Install the new catalytic converter: Securely attach it to the exhaust system, ensuring a proper seal.

4. Reconnect Battery and Clear Codes

1. Reconnect the battery: Ensure all connections are secure.
2. Clear the P0420 code: Use the OBD-II scanner to erase the error code from the vehicle's computer.
3. Test drive the vehicle: Drive the vehicle for at least 20 minutes to allow the system to recalibrate.