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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Raise the vehicle securely using jack stands.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Multimeter
• Jack and jack stands

2. Inspect and Replace Sensors

1. Locate the Oxygen Sensors:

   • Identify the upstream (pre-catalytic converter) and downstream (post-catalytic converter) oxygen sensors.

2. Remove the Sensors:

   • Use the socket set to carefully unbolt the sensors from their locations.
   • Disconnect the electrical connectors.

3. Test the Sensors:

   • Use a multimeter to check the resistance and output voltage of each sensor.
   • If readings are outside manufacturer specifications, replace the faulty sensors.

Parts Required:

• Oxygen sensors (if faulty)

3. Inspect and Replace Catalytic Converter

1. Check the Catalytic Converter:

   • Ensure there are no physical damages (cracks, holes) and the converter is not clogged.

2. Remove the Catalytic Converter:

   • Unbolt the exhaust flanges connecting the converter to the exhaust pipe.
   • Remove any heat shields if present.

3. Install the New Catalytic Converter:

   • Position the new catalytic converter and secure it with the bolts.
   • Ensure all connections are tight and leak-free.

Parts Required:

• Catalytic converter (if faulty)

4. Reset the Engine Control Module (ECM)

1. Reconnect the Battery:

   • Reconnect the battery terminals.

2. Clear the Codes:

   • Use the OBD-II scanner to clear the P0420 code from the ECM.