how to fix P0420 code in Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Replace Faulty Oxygen Sensors

1. Locate the Oxygen Sensors: Identify the upstream and downstream oxygen sensors.
2. Remove Sensors: Using an oxygen sensor socket, carefully unscrew the faulty sensors from their respective locations.
3. Install New Sensors: Apply anti-seize compound to the threads of the new sensors, then install and torque them to manufacturer specifications (typically around 30 Nm).
4. Reconnect Electrical Connectors: Ensure that the connectors are properly seated and secure.

3. Inspect and Replace the Catalytic Converter (if necessary)

1. Remove Exhaust Components: If the catalytic converter is suspected to be faulty, remove the exhaust components connected to it (bolts may require a socket set).
2. Inspect Catalytic Converter: Check for physical damage and signs of clogging or contamination.
3. Install New Catalytic Converter: Position the new catalytic converter in place and secure it with the appropriate bolts, torqueing them to manufacturer specifications (usually around 40 Nm).
4. Reattach Exhaust Components: Reconnect any removed exhaust sections and ensure that all clamps and bolts are tightened.

4. Clear Codes and Test

1. Reconnect Battery: Reconnect the negative battery terminal.
2. Clear OBD-II Codes: Use the scanner to erase the P0420 code and any related codes.
3. Test Drive the Vehicle: Drive the vehicle under various conditions to ensure the issue has been resolved.