how to fix P0420 code in my 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.
• Allow the vehicle to cool down if the engine has been running.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Exhaust gasket scraper
• Safety goggles
• Gloves

2. Inspect and Replace Oxygen Sensors

1. Locate and disconnect the upstream and downstream oxygen sensors.
   • Use a socket or wrench to remove the sensors from the exhaust system.
2. Inspect the sensors for damage or contamination.
3. If defective, install new oxygen sensors.
   • Apply anti-seize compound to the threads of the new sensors before installation.
   • Torque the sensors to the manufacturer's specifications (typically around 30 ft-lbs).
4. Reconnect the electrical connectors for the sensors.

3. Check and Replace the Catalytic Converter

1. Inspect the catalytic converter for signs of damage or clogging.
2. If replacement is necessary, remove the catalytic converter from the exhaust system.
   • Use a socket set to unbolt the converter from the exhaust pipes.
3. Clean the exhaust pipe flanges with an exhaust gasket scraper to ensure a proper seal.
4. Install the new catalytic converter.
   • Use new gaskets as required and torque bolts to the manufacturer’s specifications (usually around 30 ft-lbs).
5. Reconnect any brackets or hangers that secure the exhaust system.

4. Reset the Check Engine Light

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