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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on the exhaust system.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  • Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  • Remove the electrical connectors from both sensors.
  • Use a socket wrench to unscrew the sensors from their positions.
  • Install new oxygen sensors, ensuring proper torque (usually around 30 ft-lbs) to avoid damage.
  • Reattach the electrical connectors securely.

3. Inspect and Replace the Catalytic Converter

• Sub-steps:
  • Locate the catalytic converter along the exhaust system.
  • Remove any heat shields or brackets securing the converter.
  • Use a wrench or socket set to unbolt the catalytic converter from the exhaust pipes.
  • Inspect the old converter for any signs of blockage or damage; compare with the new part.
  • Install the new catalytic converter, ensuring to use new gaskets if necessary.
  • Torque the bolts to manufacturer specifications (typically 25-30 ft-lbs) to prevent leaks.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.