how to fix P0420 code in Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream oxygen sensor:
   • Use an O2 sensor socket to unscrew the sensor from the exhaust manifold.
   • Disconnect the electrical connector.
2. Install the new upstream oxygen sensor:
   • Apply anti-seize compound to the threads of the new sensor.
   • Screw in the sensor and tighten to manufacturer specification (typically around 30 lb-ft).
3. Remove the downstream oxygen sensor:
   • Repeat the same steps as above for the downstream sensor.
4. Install the new downstream oxygen sensor:
   • Follow the same procedure and ensure proper connection.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove the catalytic converter:
   • Use a socket set to unbolt the flanges connecting the catalytic converter to the exhaust pipes.
   • Carefully remove the catalytic converter from its mounts.
2. Install the new catalytic converter:
   • Position the new converter in place and align with the exhaust pipes.
   • Bolt it securely, ensuring proper fitment and no exhaust leaks (torque specifications vary; typically 25-30 lb-ft).
3. Reconnect any heat shields or mounts.

4. Reconnect Battery and Clear Codes

1. Reconnect the battery terminal and ensure it is tightly secured.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.