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

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the battery to ensure safety.
• Raise the vehicle securely on jack stands if working underneath.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Use an O2 sensor socket to remove the upstream sensor.
  3. Install the new upstream oxygen sensor and torque to manufacturer specifications (typically 30 lb-ft).
  4. Repeat the process for the downstream oxygen sensor if necessary.
• Tools Required: O2 sensor socket, torque wrench.

3. Examine and Replace the Catalytic Converter

• Sub-steps:
  1. Inspect the catalytic converter for any signs of damage or blockage.
  2. If replacement is needed, unbolt the catalytic converter from the exhaust system. Ensure to keep any gaskets for reuse or replace them as needed.
  3. Install the new catalytic converter, ensuring it is aligned correctly and bolts are torqued to specifications (typically 30 lb-ft).
• Tools Required: Socket set, torque wrench.

4. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the battery and use the OBD-II scanner to clear the P0420 code.
  2. Start the vehicle and allow it to reach operating temperature.
  3. Perform a test drive under various conditions (highway and city).
• Tools Required: OBD-II scanner.