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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, jack stands, and safety goggles.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace O2 Sensors (if needed)

1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) O2 sensors.
2. Remove the O2 sensors using a socket wrench.
3. Inspect the sensors for carbon buildup or damage; replace if necessary.
   • Parts Required: New O2 sensors (if required).
4. Install new O2 sensors and torque them to the manufacturer's specifications (usually around 30-40 ft-lbs).
5. Reconnect the battery terminal.

3. Examine and Replace the Catalytic Converter (if needed)

1. If the O2 sensors are functioning properly, inspect the catalytic converter for clogs or physical damage.
2. Remove any exhaust clamps or bolts securing the catalytic converter to the exhaust system.
3. Detach the catalytic converter carefully.
4. Install a new catalytic converter, ensuring proper alignment.
   • Parts Required: New catalytic converter (if required).
5. Secure the converter with exhaust clamps or bolts and torque to specifications.

4. Clear Diagnostic Codes

1. Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
2. Take the vehicle for a test drive to ensure the repair is effective.