how to fix P0420 code on Toyota Camry XV70 (2018-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical issues during repairs.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream oxygen sensor:
  1. Locate the upstream oxygen sensor on the exhaust manifold.
  2. Use the O2 sensor socket to unscrew and remove it.
  3. Install the new oxygen sensor and torque it to the manufacturer’s specifications (usually around 30 ft-lbs).
• Repeat the process for the downstream oxygen sensor.

3. Inspect and Replace Catalytic Converter (if needed)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter (if required).
• Remove the catalytic converter:
  1. Raise the vehicle using a jack and secure it with jack stands.
  2. Unbolt the catalytic converter from the exhaust system using the socket set.
  3. If necessary, cut the exhaust pipe using the exhaust pipe cutter for easier removal.
• Install the new catalytic converter:
  1. Position the new catalytic converter in place.
  2. Bolt it securely using new gaskets as recommended by the manufacturer.
  3. Ensure all connections are tight and free of leaks.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear any fault codes from the engine control module (ECM).