how to fix P0420 code on Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, oxygen sensor socket, exhaust pipe cutter, jack stands, safety goggles, gloves.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Locate the Oxygen Sensors: Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.
2. Remove the Oxygen Sensors:
   • Use the oxygen sensor socket to unscrew the sensors.
   • Disconnect the wiring harness from each sensor.
3. Install New Oxygen Sensors:
   • Apply anti-seize compound to the threads of the new sensors.
   • Install the new sensors and tighten to manufacturer specifications (typically 30-40 ft-lbs).
   • Reconnect the wiring harness.

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

1. Examine the Catalytic Converter: Look for signs of physical damage or excessive carbon buildup.
2. Remove the Catalytic Converter:
   • Use an exhaust pipe cutter to carefully detach the converter from the exhaust system.
   • Ensure to support the exhaust to avoid strain on other components.
3. Install New Catalytic Converter:
   • Position the new catalytic converter in place.
   • Secure it with new gaskets and bolts, tightening to manufacturer specifications (typically 30-40 ft-lbs).
   • Make sure all connections are leak-free.

4. Clear Codes and Reconnect Battery

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear any stored codes.