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

Solution

1. Preparation

• Gather all necessary tools and parts before starting the repair.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Repair Exhaust System

• Tools Required: Socket set, torque wrench, exhaust leak detection solution.
• Inspect the entire exhaust system for leaks. Use an exhaust leak detection solution to locate any small leaks.
• If leaks are found, tighten or replace any loose or damaged components.

3. Replace Faulty Oxygen Sensors

• Tools Required: Oxygen sensor socket, ratchet, torque wrench.
• Locate the upstream and downstream oxygen sensors.
• Use an oxygen sensor socket to remove the faulty sensors.
• Apply anti-seize compound on the threads of the new sensors, install them, and tighten to the manufacturer's torque specification (usually around 30 lb-ft).

4. Replace Catalytic Converter (if necessary)

• Tools Required: Exhaust pipe cutter, flaring tool, socket set, torque wrench.
• If diagnostic steps indicate a faulty catalytic converter, follow these steps:
  1. Use an exhaust pipe cutter to remove the catalytic converter.
  2. Prepare the new catalytic converter for installation, ensuring it matches the original specifications.
  3. Install the new catalytic converter and secure it with new gaskets and bolts, tightening to the manufacturer’s specifications (typically around 30 lb-ft).

5. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use an OBD-II scanner to clear the P0420 code from the system.