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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: O2 sensor socket, wrench set, OBD-II scanner
• Sub-steps:
  1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use the O2 sensor socket to remove the sensors from the exhaust system.
  4. Install the new oxygen sensors, ensuring they are torqued to the manufacturer's specifications (usually around 30-40 ft-lbs).
  5. Reconnect the electrical connectors.

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

• Tools Required: Wrench set, gasket scraper, exhaust sealant, torque wrench
• Sub-steps:
  1. If the catalytic converter is damaged or clogged, remove it by loosening the bolts connecting it to the exhaust manifold and the exhaust pipe.
  2. Clean the mating surfaces with a gasket scraper to ensure a proper seal.
  3. Install the new catalytic converter, applying exhaust sealant to the gasket if required.
  4. Torque the bolts to the manufacturer's specifications (typically around 25-30 ft-lbs).

4. Clear the Error Code

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the vehicle battery.
  2. Use the OBD-II scanner to clear the P0420 code from the ECM.