how to fix P0420 code in Toyota RAV4 Fifth Generation (2019-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to avoid electrical shorts during repair.
• Allow the vehicle to cool if the engine has been running.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream O2 sensor:

   • Use an O2 sensor socket to unscrew the upstream O2 sensor from the exhaust manifold.
   • Disconnect the electrical connector.

2. Install the new upstream O2 sensor:

   • Apply anti-seize compound to the threads of the new sensor.
   • Install and tighten the new sensor to the manufacturer’s specifications (typically around 30 lb-ft of torque).
   • Reconnect the electrical connector.

3. Repeat for the downstream O2 sensor:

   • Follow the same steps as above for the downstream O2 sensor located after the catalytic converter.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove the catalytic converter:

   • Unbolt the catalytic converter from the exhaust system using a socket set.
   • Carefully detach any brackets or hangers supporting the converter.

2. Install the new catalytic converter:

   • Position the new catalytic converter and secure it with bolts, ensuring to tighten them to manufacturer specifications.
   • Reattach any brackets or hangers.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.