how to fix P0420 code on my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a flat surface with the engine off and cool.
• Disconnect the battery to prevent any electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Remove the Negative Battery Terminal: Use a 10mm socket to disconnect the battery.
2. Locate the Oxygen Sensors: Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) sensors.
3. Test the Sensors: Use a multimeter to check the voltage output of both sensors. Replace any that are faulty.
4. Remove the Sensors: Use an oxygen sensor socket to unscrew and remove the sensors.
5. Install New Sensors: Apply anti-seize compound on the threads of new sensors and install them securely.

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

1. Locate the Catalytic Converter: Find the catalytic converter in the exhaust system.
2. Check for Damage: Inspect the converter for physical damage or excessive contamination.
3. Remove Exhaust Components: Loosen and remove exhaust hangers and bolts using a socket set.
4. Remove the Catalytic Converter: Carefully detach the converter from the exhaust system.
5. Install the New Catalytic Converter: Position the new converter and secure it using new gaskets and bolts to manufacturer specifications (use torque wrench for proper torque).
6. Reattach Exhaust Components: Reinstall exhaust hangers and ensure everything is secure.

4. Reset the Engine Control Module (ECM)

1. Reconnect the Battery: Reattach the negative battery terminal.
2. Clear the Codes: Use an OBD-II scanner to erase any stored codes from the ECM.