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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent any electrical issues during repairs.

2. Inspect and Replace Oxygen Sensors

1. Locate the Oxygen Sensors: Identify the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
2. Remove the Sensors: Use an oxygen sensor socket to carefully unscrew and remove the sensors from their locations.
3. Inspect the Wiring: Check the wiring and connectors for damage or corrosion; replace if necessary.
4. Install New Sensors: Apply anti-seize compound to the threads of the new sensors, then install them securely. Torque to manufacturer's specifications (typically around 30 ft-lbs).

3. Inspect and Replace the Catalytic Converter

1. Access the Catalytic Converter: Raise the vehicle and secure it with jack stands. Remove any heat shields if applicable.
2. Remove the Catalytic Converter: Unbolt the catalytic converter from the exhaust system using a socket set. Ensure to remove any mounting brackets.
3. Inspect for Damage: Check for signs of physical damage or clogging. If damaged, proceed to replace it.
4. Install the New Catalytic Converter: Position the new catalytic converter and secure it with bolts and brackets. Torque to specifications (typically around 40-50 ft-lbs).

4. Clear Codes and Test

1. Reconnect the Battery: Restore the battery connection.
2. Clear the Codes: Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
3. Test Drive: Drive the vehicle under various conditions to ensure the code does not return.