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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the exhaust system to cool down before starting work.

2. Inspect and Replace Oxygen Sensors (if faulty)

1. Locate the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Use a socket wrench to remove the oxygen sensors from their respective locations.
3. Inspect the sensor tips for carbon buildup or damage; replace if necessary.
4. Install new oxygen sensors, ensuring they are tightened to manufacturer torque specifications (usually around 30-40 ft-lbs).
5. Reconnect the sensor wiring harness.

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

1. If the catalytic converter is damaged or clogged, prepare to replace it.
2. Remove any heat shields or brackets securing the catalytic converter.
3. Use a cutting tool (if necessary) to detach the catalytic converter from the exhaust pipes.
4. Install the new catalytic converter, ensuring proper alignment with mounting brackets.
5. Tighten all bolts and connections to manufacturer torque specifications (usually around 30-40 ft-lbs).

4. Reset the Engine Control Module (ECM)

1. Reconnect the battery.
2. Use an OBD-II scanner to clear the P0420 code and any other related codes.
3. Start the engine and let it idle for a few minutes.