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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool if it has been running recently.

2. Inspect and Replace Oxygen Sensors

1. Locate Oxygen Sensors
   • Identify the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
2. Remove Oxygen Sensors
   • Use an oxygen sensor socket or wrench to carefully unscrew the sensors.
   • Inspect the threads for damage.
3. Install New Oxygen Sensors
   • Apply anti-seize compound on the threads of the new sensors.
   • Torque the sensors to the manufacturer-recommended specification (usually around 30 lb-ft).

3. Inspect and Replace the Catalytic Converter

1. Remove Catalytic Converter
   • Loosen and remove the bolts or nuts holding the catalytic converter using a socket set.
   • Carefully detach the catalytic converter from the exhaust system.
2. Inspect for Damage
   • Check the old catalytic converter for signs of clogging, rattling, or physical damage.
3. Install New Catalytic Converter
   • Place the new catalytic converter in position.
   • Secure it with new bolts/nuts, torquing them to the specified value (typically around 30 lb-ft).

4. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0420 code from the system.