how to fix P0420 code in Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent any electrical shorts.
• Allow the exhaust system to cool before starting work.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Use an O2 sensor socket to remove the upstream oxygen sensor.
3. Install the new upstream oxygen sensor and torque it to 30 Nm (22 ft-lbs).
4. Repeat the process for the downstream oxygen sensor if necessary.
5. Reconnect the battery terminal.

3. Inspect and Replace Catalytic Converter (if required)

1. Remove the exhaust heat shield if present, using a socket set.
2. Disconnect the exhaust pipes connected to the catalytic converter by loosening the bolts.
3. Remove the catalytic converter from its mounting brackets.
4. Install the new catalytic converter, ensuring proper alignment with the exhaust pipes.
5. Torque the bolts to the manufacturer’s specifications (typically around 40 Nm or 30 ft-lbs).
6. Reinstall the exhaust heat shield.