my Toyota Camry Eighth Generation (2018-present) has a P0420 code how to fix this

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, jack and jack stands, socket set, safety glasses, gloves.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts during repairs.

2. Inspect and Replace Oxygen Sensors

1. Remove the O2 Sensors:
   • Use a socket wrench to remove the upstream (before catalytic converter) and downstream (after catalytic converter) oxygen sensors.
   • Inspect the sensors for contamination or damage.
2. Install New O2 Sensors:
   • Install new oxygen sensors, ensuring they are tightened to the manufacturer's torque specifications (typically around 30 lb-ft).
   • Reconnect the electrical connectors to each sensor.

3. Inspect and Replace Catalytic Converter (if needed)

1. Remove the Old Catalytic Converter:
   • Use a socket set to unbolt the catalytic converter from the exhaust manifold and the exhaust pipe.
   • Carefully remove the old catalytic converter from the vehicle, ensuring no exhaust gases escape.
2. Install New Catalytic Converter:
   • Position the new catalytic converter in place and secure it with the original bolts or new hardware (if recommended).
   • Make sure to torque the bolts to manufacturer specifications (around 30 lb-ft).

4. Reset the Engine Control Module (ECM)

1. Reconnect the Battery:
   • Reconnect the negative battery terminal.
2. Clear the P0420 Code:
   • Use the OBD-II scanner to clear the trouble codes from the ECM.
3. Test Drive:
   • Take the vehicle for a test drive to ensure the code does not reappear and that the engine runs smoothly.