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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Using the O2 sensor socket, carefully remove the upstream oxygen sensor.
  3. Install the new oxygen sensor and torque it to the manufacturer's specification (typically around 30 lb-ft).
  4. Repeat for the downstream oxygen sensor if needed.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, jack stands, exhaust pipe cutter (if necessary)
• Sub-steps:
  1. Raise the vehicle securely using jack stands.
  2. Inspect the catalytic converter for physical damage or blockage.
  3. If replacement is necessary, disconnect the exhaust pipes from the catalytic converter using a socket set.
  4. Remove any bolts or clamps securing the catalytic converter.
  5. Install the new catalytic converter, ensuring proper alignment and sealing of joints.
  6. Torque all bolts to the manufacturer's specification.

4. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0420 code and any other related codes.