how to fix P0420 code in Toyota Camry Eighth Generation (2018-present)

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 any electrical shorts.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream oxygen sensor from the exhaust manifold:
  1. Locate the upstream O2 sensor (usually near the engine).
  2. Use the O2 sensor socket to unscrew and remove it.
  3. Install the new sensor and torque it to the manufacturer's specifications (typically 30-40 lb-ft).
• Repeat for the downstream oxygen sensor if testing indicates it is faulty.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter, gasket scraper.
• Raise the vehicle and secure it on jack stands.
• Remove the exhaust components leading to the catalytic converter:
  1. Disconnect any clamps or bolts holding the exhaust pipes.
  2. Carefully remove the exhaust sections leading to the catalytic converter.
• Remove the catalytic converter:
  1. Unbolt the catalytic converter from its mounting points.
  2. Replace with a new catalytic converter, ensuring proper alignment.
  3. Reinstall exhaust components and tighten bolts to manufacturer specifications.

4. Reconnect Battery and Clear Codes

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