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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid electrical shocks.
• Allow the engine to cool before starting work on the exhaust system.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  • Locate the upstream and downstream oxygen sensors.
  • Use a socket wrench to remove the sensors from the exhaust system.
  • Inspect the sensors for carbon build-up or damage.
  • Install new oxygen sensors (ensure they are compatible with your model).
  • Torque the sensors to manufacturer specifications (usually around 30 ft-lbs, check service manual for exact values).

3. Inspect and Replace Catalytic Converter

• Sub-steps:
  • Disconnect the exhaust pipes connected to the catalytic converter using a socket set.
  • Remove any heat shields or brackets holding the catalytic converter in place.
  • Carefully remove the catalytic converter from the vehicle.
  • Install the new catalytic converter, ensuring proper alignment with exhaust pipes.
  • Reconnect all exhaust pipes and heat shields.
  • Torque all connections to the specified values.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's memory.