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 battery to prevent any electrical issues.

2. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench, multimeter.
• Sub-steps:
  1. Remove the upstream oxygen sensor by using the O2 sensor socket and wrench.
  2. Inspect the sensor for damage and test its resistance with a multimeter. Replace if faulty.
  3. Repeat for the downstream oxygen sensor if it shows issues.

3. Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, torque wrench, exhaust hanger removal tool.
• Sub-steps:
  1. Raise the vehicle safely and support it on jack stands.
  2. Remove any heat shields or exhaust components obstructing access to the catalytic converter.
  3. Unbolt the catalytic converter from the exhaust system.
  4. Remove and replace the gaskets as needed to ensure a proper seal.
  5. Install the new catalytic converter, ensuring it is oriented correctly.
  6. Torque the bolts to manufacturer specifications (usually around 30-40 lb-ft, check specific guidelines).
  7. Reinstall any removed components and heat shields.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear any error codes and check for reoccurrence.