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

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the vehicle's battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Replace Faulty Oxygen Sensors

• Tools Required: O2 sensor socket, torque wrench, multimeter.
• Remove the oxygen sensor wiring harness.
• Use the O2 sensor socket to unscrew the pre-catalytic oxygen sensor and replace it with a new one.
• Torque the new sensor to the manufacturer's specification (usually around 30 lb-ft).
• Repeat for the post-catalytic oxygen sensor if needed.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, pry bar, exhaust hanger removal tool.
• Disconnect the exhaust pipe from the catalytic converter by removing the bolts with a socket set.
• Use a pry bar if necessary to detach the converter from the exhaust hangers.
• Remove the catalytic converter and inspect it for any cracks or damage.
• Install the new catalytic converter, ensuring proper alignment with the exhaust system.
• Torque the bolts to the manufacturer's specifications (typically around 30 lb-ft).

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle's battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
• Start the engine and let it run for a few minutes to ensure proper operation.