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

Solution

1. Preparation

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

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
2. Remove the electrical connectors from both sensors.
3. Use an O2 sensor socket to unscrew the sensors from the exhaust pipe.
4. Install new oxygen sensors and torque to manufacturer specifications (typically around 30 lb-ft).
5. Reconnect the electrical connectors ensuring they click into place.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove the exhaust heat shield if present by unscrewing the bolts.
2. Unbolt the catalytic converter from the exhaust system using a socket set.
3. Inspect the gasket and replace if worn or damaged.
4. Install the new catalytic converter, ensuring proper alignment.
5. Torque bolts to manufacturer specifications (usually around 30 lb-ft).
6. Reattach the heat shield if removed.

4. Reconnect Battery and Clear Codes

1. Reconnect the negative battery terminal.
2. Use an OBD-II scanner to clear the P0420 code and any other related codes stored in the vehicle's computer.