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

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the battery to ensure safety while working on the vehicle.

2. Inspect and Replace Oxygen Sensors

• Sub-steps:
  1. Locate the upstream (pre-catalytic) and downstream (post-catalytic) oxygen sensors.
  2. Unplug the electrical connector from each sensor.
  3. Use an O2 sensor socket to remove the sensors from the exhaust piping.
  4. Install new oxygen sensors in reverse order of removal and ensure they are properly torqued (typically 30-40 ft-lbs).
  5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

• Sub-steps:
  1. Examine the catalytic converter for signs of damage or blockage.
  2. If replacement is needed, unbolt the exhaust piping from the catalytic converter using a socket set.
  3. Remove the old catalytic converter and replace it with a new one, ensuring proper positioning.
  4. Torque the bolts to manufacturer specifications (usually around 30-40 ft-lbs).
  5. Reattach any heat shields if applicable.

4. Clear the Codes

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.