how to fix P0420 code on my Toyota RAV4 Fourth Generation (2013-2018)

Solution

1. Preparation

• Gather all tools and parts necessary for the repair.
• Disconnect the negative battery terminal to avoid any electrical issues.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream oxygen sensor:
   • Use an oxygen sensor socket and ratchet to unscrew the sensor.
   • Inspect the sensor for damage or contamination.
2. Install the new oxygen sensor:
   • Apply anti-seize compound to the threads of the new sensor.
   • Screw in the new sensor and tighten to the manufacturer’s specifications (typically around 30-40 ft-lbs).
3. Repeat for the downstream oxygen sensor if needed:
   • Follow the same steps as above.

3. Inspect and Replace the Catalytic Converter

1. Remove the exhaust pipe:
   • Use a socket set to unbolt the exhaust pipe from the catalytic converter.
   • Remove any hangers or clamps securing the pipe.
2. Remove the old catalytic converter:
   • Unbolt the catalytic converter from the exhaust manifold and exhaust pipe.
   • Carefully detach the converter from the vehicle.
3. Install the new catalytic converter:
   • Position the new converter and bolt it to the exhaust manifold and exhaust pipe.
   • Use a torque wrench to tighten bolts to the manufacturer’s specifications (usually around 40-60 ft-lbs).
4. Reattach the exhaust pipe and any hangers or clamps.

4. Final Checks

• Reconnect the negative battery terminal.
• Clear the error codes using the OBD-II scanner.
• Start the vehicle and allow it to reach operating temperature.