how to fix P0420 code in Honda CR-V Fifth Generation (2017-2022)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a flat surface, and engage the parking brake.
• Disconnect the battery to prevent any electrical issues.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Exhaust pipe cutter (if necessary)
• Safety glasses and gloves

2. Inspect and Replace Oxygen Sensors

1. Locate Oxygen Sensors:

   • Identify the upstream and downstream oxygen sensors attached to the exhaust system.

2. Remove Oxygen Sensors:

   • Use the appropriate socket to unscrew the sensors from the exhaust pipes.
   • Disconnect the electrical connectors carefully.

3. Install New Oxygen Sensors:

   • Apply anti-seize compound to the threads of the new sensors.
   • Screw in the new sensors and tighten to manufacturer specifications (typically around 30 Nm).
   • Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter

1. Remove Exhaust Components:

   • If necessary, use the exhaust pipe cutter to remove any sections of the exhaust leading to the catalytic converter.
   • Detach the catalytic converter from the exhaust manifold and downstream piping.

2. Install New Catalytic Converter:

   • Position the new catalytic converter in place, ensuring proper alignment.
   • Use new gaskets as needed to prevent leaks.
   • Secure the catalytic converter with bolts and nuts, torquing to manufacturer specifications (usually around 40-50 Nm).

3. Reinstall Exhaust Components:

   • Reattach any exhaust sections removed earlier, ensuring all connections are secure.

4. Final Checks

• Reconnect the battery.
• Start the engine and check for any exhaust leaks around the newly installed components.
• Clear the P0420 code using the OBD-II scanner.