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

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the battery to ensure safety.
• Lift the vehicle securely using jack stands.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Use a socket wrench to carefully remove the sensors.
  3. Inspect the sensors for damage or contamination. Replace if necessary.
  4. Clean the sensor ports to remove any carbon buildup.
  5. Install new sensors and torque to manufacturer specifications (typically 30-40 lb-ft).

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

• Sub-steps:
  1. Remove the exhaust pipes connected to the catalytic converter using a socket set.
  2. Inspect the catalytic converter for signs of clogging or physical damage.
  3. If replacement is needed, install a new catalytic converter, ensuring proper alignment with the exhaust manifold and pipes.
  4. Securely tighten all connections and use new gaskets where necessary.
  5. Reconnect any sensors that were disconnected.

4. Clear Error Codes

• Sub-steps:
  1. Reconnect the battery.
  2. Use an OBD-II scanner to clear the P0420 code.
  3. Start the vehicle and allow it to reach operating temperature.