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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.
• Allow the engine to cool before starting any work on the exhaust system.

2. Inspect and Replace Oxygen Sensors

1. Remove the negative battery cable to prevent electrical shorts.
2. Locate the upstream and downstream oxygen sensors (usually near the exhaust manifold and after the catalytic converter).
3. Using an O2 sensor socket, carefully unscrew the sensors from their mounts.
4. Inspect the sensors for any signs of damage or contamination.
5. Install new oxygen sensors:
   • Apply anti-seize compound to the threads of the new sensors.
   • Torque to manufacturer specifications (typically around 30 lb-ft).
6. Reconnect the battery once the sensors are installed.

3. Inspect and Replace the Catalytic Converter

1. Remove the exhaust manifold bolts and any brackets securing the catalytic converter.
2. Disconnect the catalytic converter from the exhaust system, which may involve cutting or loosening clamps.
3. Inspect the old catalytic converter for damage or blockage.
4. Install the new catalytic converter:
   • Align the converter with the exhaust piping.
   • Secure it using new gaskets and bolts, torqued to manufacturer specifications (typically around 30 lb-ft).
5. Reattach any brackets or heat shields removed during the process.

4. Clear Error Codes and Test Drive

1. Use an OBD-II scanner to clear the P0420 code from the vehicle's memory.
2. Perform a test drive to ensure the vehicle operates normally and monitor for the check engine light.