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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.
• Raise the vehicle using a jack and secure with jack stands.

2. Inspect and Replace Oxygen Sensors

• Tools Needed: O2 sensor socket, ratchet, torque wrench.
• Steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Disconnect the electrical connectors from both sensors.
  3. Use the O2 sensor socket to remove the sensors from the exhaust pipe.
  4. Install the new sensors by threading them into the exhaust pipe and tighten to manufacturer specifications (typically around 30-35 lb-ft).
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Needed: Socket set, torque wrench, exhaust pipe cutter (if needed).
• Steps:
  1. Examine the catalytic converter for damage or clogging. If damaged, proceed to replace.
  2. If replacing, use the exhaust pipe cutter to remove the old catalytic converter.
  3. Install the new catalytic converter by aligning it with the exhaust system and securing it with bolts.
  4. Torque the bolts to the manufacturer's specifications (typically around 25-30 lb-ft).

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminal securely.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.