how to fix P0420 code on my Toyota RAV4 XA50 (2019-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Raise the vehicle on jack stands for access to the exhaust system.

2. Inspect Oxygen Sensors

• Locate the upstream and downstream oxygen sensors.
• Disconnect the electrical connectors from both sensors.
• Use a multimeter to measure the voltage output of the upstream sensor (should fluctuate between 0.1V and 0.9V).
• If the readings are outside this range, replace the faulty oxygen sensor.

3. Check Catalytic Converter

• Inspect the catalytic converter for any physical damage, such as dents or signs of overheating.
• If the converter appears damaged or restricted, replace it with an OEM or high-quality aftermarket part.
• Ensure all gaskets are in good condition to prevent exhaust leaks during installation.

4. Reinstall Components

• Reinstall the oxygen sensors and torque them to the manufacturer’s specifications (usually around 30-40 lb-ft).
• Reconnect the battery and ensure all connections are secure.

5. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
• Perform a test drive to ensure the vehicle operates normally and check for the reappearance of the code.