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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the vehicle to cool down completely.

2. Inspect and Replace O2 Sensors

1. Locate O2 Sensors:

   • Identify the upstream (pre-catalytic) and downstream (post-catalytic) O2 sensors.

2. Remove O2 Sensors:

   • Use an O2 sensor socket to carefully unscrew the sensors from the exhaust pipes.
   • Disconnect the wiring harness from each sensor.

3. Install New O2 Sensors:

   • Apply anti-seize compound to the threads of the new O2 sensors.
   • Install the new sensors by hand, then tighten them to the manufacturer's torque specifications (typically around 30 lb-ft).

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove Exhaust Components:

   • Unbolt any exhaust hangers or brackets securing the catalytic converter.
   • Use a socket set to remove the bolts connecting the catalytic converter to the exhaust pipes.

2. Install New Catalytic Converter:

   • Position the new catalytic converter in place.
   • Secure it by tightening the bolts to the specified torque value (usually around 25-30 lb-ft for exhaust components).

4. Reset the OBD-II System

1. Reconnect the Battery:

   • Reconnect the battery terminals securely.

2. Clear Codes:

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