Honda CR-V Sixth Generation (2023-present) check engine light and P0420 code

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Fuel pressure gauge

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors.
2. Disconnect the electrical connectors from both sensors.
3. Use a socket wrench to unscrew and remove the oxygen sensors.
4. Install new oxygen sensors by following the reverse order:
   • Apply anti-seize compound to the threads (if not pre-applied).
   • Torque the sensors to the manufacturer’s specifications (typically around 30 lb-ft).
5. Reconnect the electrical connectors ensuring they are secure.

3. Inspect and Replace the Catalytic Converter (if necessary)

1. If diagnostics indicated a faulty catalytic converter, remove the exhaust components connected to it.
2. Use a socket set to remove the bolts securing the catalytic converter to the exhaust manifold and exhaust pipe.
3. Remove the old catalytic converter and replace it with a new one, ensuring proper alignment.
4. Torque the bolts to manufacturer specifications (usually around 30-40 lb-ft).
5. Reassemble any disconnected exhaust components.

4. Clear Codes and Test

1. Reconnect the battery.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
3. Start the engine and allow it to reach operating temperature.
4. Monitor the vehicle for any check engine light re-illumination.