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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Lift the vehicle securely on jack stands.

2. Inspect and Replace O2 Sensors

1. Remove the Front O2 Sensor

   • Locate the front O2 sensor (upstream of the catalytic converter).
   • Use an O2 sensor socket to remove it.
   • Tools Required: O2 sensor socket, ratchet, and extension.

2. Install New Front O2 Sensor

   • Apply anti-seize compound to the threads of the new O2 sensor.
   • Install the new sensor and torque it to the manufacturer's specifications (usually around 30-40 lb-ft).

3. Repeat for Rear O2 Sensor

   • Locate and remove the rear O2 sensor (downstream of the catalytic converter).
   • Replace it with a new sensor following the same steps as above.

3. Inspect and Replace Catalytic Converter

1. Remove the Catalytic Converter

   • Loosen the bolts connecting the catalytic converter to the exhaust system using a socket set.
   • Carefully lower the catalytic converter from its mounting points.

2. Install New Catalytic Converter

   • Position the new catalytic converter in place.
   • Align the flanges and secure with bolts.
   • Torque bolts to the manufacturer's specification (typically 25-30 lb-ft).

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear any error codes from the vehicle's computer.