how to fix P0420 code in my Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather tools and materials.
• Ensure the vehicle is on a level surface, and the engine is cool.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
2. Using an O2 sensor socket, remove the upstream oxygen sensor.
3. Install a new oxygen sensor and torque it to the manufacturer’s specification (typically 30 Nm / 22 lb-ft).
4. Repeat the process for the downstream oxygen sensor if it shows signs of failure.

3. Inspect the Catalytic Converter

1. Inspect the catalytic converter for physical damage or clogging.
2. If damaged, remove the catalytic converter by loosening the bolts connecting it to the exhaust system.
3. Replace with a new catalytic converter and ensure all connections are secure.
4. Torque all bolts to the manufacturer’s specifications.

4. Clear Codes and Test

1. Reconnect the battery.
2. Use the OBD-II scanner to clear the P0420 code.
3. Start the engine and allow it to reach operating temperature.
4. Take the vehicle for a test drive under various conditions to ensure the code does not return.