how do I fix P0420 code on my Honda CR-V Sixth Generation (2023-present)?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, safety glasses, gloves.
• Sub-steps:
  • Park the vehicle on a flat surface and engage the parking brake.
  • Disconnect the negative battery terminal to prevent electrical shorts and ensure safety.

2. Inspect and Replace Oxygen Sensors

• Tools Required: Socket set, oxygen sensor socket.
• Sub-steps:
  • Locate the upstream and downstream oxygen sensors. The upstream sensor is before the catalytic converter, and the downstream sensor is after.
  • Use the oxygen sensor socket to carefully unscrew the faulty oxygen sensor.
  • Install the new oxygen sensor and ensure it is tightened to manufacturer specifications (typically around 30 lb-ft).
  • Reconnect the wiring harness to the sensor.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, jack and jack stands, exhaust gasket, torque wrench.
• Sub-steps:
  • Raise the vehicle using a jack and secure it with jack stands.
  • Remove the bolts securing the catalytic converter to the exhaust system using a socket set.
  • Carefully detach the catalytic converter from the exhaust system. Inspect the exhaust gasket and replace if necessary.
  • Install the new catalytic converter, ensuring that it is properly aligned and secured.
  • Tighten all bolts to the manufacturer’s torque specifications (usually around 25 lb-ft).

4. Clear Error Codes

• Tools Required: OBD-II scanner.
• Sub-steps:
  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.