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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to avoid any electrical issues while working on the vehicle.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
2. Unplug the electrical connectors from both sensors.
3. Use an O2 sensor socket to remove the sensors from the exhaust system.
4. Install new oxygen sensors, applying anti-seize compound to the threads if required.
5. Torque the new sensors to the manufacturer’s specifications (usually around 30 lb-ft).
6. Reconnect the electrical connectors to both sensors.

3. Inspect and Replace Catalytic Converter

1. If the oxygen sensors are functioning correctly, inspect the catalytic converter for physical damage.
2. If it is clogged or damaged, remove the exhaust pipes connected to the catalytic converter.
3. Use a socket set to unbolt the catalytic converter from the exhaust manifold and rear pipe.
4. Install the new catalytic converter, ensuring proper alignment with exhaust hangers.
5. Torque the bolts to the specified manufacturer’s torque settings (typically 30-40 lb-ft).
6. Reattach the exhaust pipes and any heat shields.

4. Reset the Check Engine Light

1. Reconnect the battery if it was disconnected at the start of the procedure.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.
3. Run the vehicle to ensure the code does not reappear.