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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid electrical issues during repairs.

Tools Required:

• OBD-II scanner
• Multimeter
• Socket set
• Torque wrench
• Safety glasses
• Jack and jack stands

2. Inspect and Test Oxygen Sensors

• Remove the connectors from both the upstream and downstream oxygen sensors.
• Use a multimeter to measure the resistance of the sensors; refer to manufacturer specifications.
• If either sensor is faulty, replace it with a new one.

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

• Remove Exhaust Components:

  • Loosen and remove the bolts securing the catalytic converter to the exhaust manifold and the exhaust pipe.
  • Carefully lower the catalytic converter from the vehicle.

• Inspect the Catalytic Converter:

  • Check for physical damage, signs of overheating, or clogging.
  • If damaged, replace it with a new catalytic converter that meets OEM specifications.

• Install New Catalytic Converter:

  • Position the new catalytic converter in place.
  • Reattach the bolts and tighten them to the manufacturer's specified torque values.

4. Clear Codes and Test Drive

• Reconnect the battery and use the OBD-II scanner to clear the P0420 code.
• Conduct a test drive to monitor for any reoccurrence of the check engine light.