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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to avoid electrical shorts.

2. Inspect and Replace Faulty Oxygen Sensors

• Tools Required: OBD-II scanner, socket set, multimeter
• Sub-steps:
  1. Identify the locations of the upstream and downstream oxygen sensors.
  2. Using a socket set, carefully remove the malfunctioning oxygen sensors.
  3. Compare the readings from both sensors using the multimeter. If the downstream sensor shows minimal voltage fluctuation compared to the upstream, it may need replacement.
  4. Install new oxygen sensors by reversing the removal process; ensure they are torqued to manufacturer specifications.

3. Examine and Replace the Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust pipe cutter (if necessary)
• Sub-steps:
  1. If the oxygen sensors are functioning correctly, proceed to inspect the catalytic converter for clogs or damage.
  2. Remove the exhaust components connected to the catalytic converter, using an exhaust pipe cutter if necessary.
  3. Remove the old catalytic converter and install the new one, ensuring proper alignment.
  4. Torque the bolts to the manufacturer's specifications.

4. Clear Error Codes

• Tools Required: OBD-II scanner
• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code from the computer.
  3. Restart the vehicle and check for the check engine light.