how to fix P0420 code on Honda CR-V Sixth Generation (2023-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shorts during the repair.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Safety goggles
• Jack and jack stands

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 Oxygen Sensors: Using the appropriate socket, carefully unscrew and remove each sensor.
3. Inspect the Sensors: Check for signs of contamination or damage. If found, replace the sensors.
4. Install New Sensors: Apply anti-seize compound on the threads of the new sensors and install them, ensuring they are secure but not over-tightened.
5. Reconnect the Battery: Reconnect the negative terminal of the battery.

3. Inspect and Replace the Catalytic Converter

1. Safely Lift the Vehicle: Use a jack and jack stands to elevate the vehicle for access.
2. Remove the Exhaust Components: Unbolt the exhaust sections leading to the catalytic converter using the socket set.
3. Inspect the Catalytic Converter: Check for any significant damage or blockage.
4. Replace the Catalytic Converter: If necessary, install a new catalytic converter, ensuring proper alignment with exhaust pipes.
5. Torque Specifications: Secure all bolts to the manufacturer-specified torque settings.

4. Reset the Check Engine Light

1. Use the OBD-II Scanner: Connect the OBD-II scanner to clear the P0420 code from the engine control module.
2. Test Drive the Vehicle: Take the vehicle for a test drive to ensure proper operation and that the check engine light does not reappear.