how to fix the Tesla Model 3 Original (2017-2023) with code P0420

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, safety goggles, gloves.
• Safety Warnings: Disconnect the battery before starting any repair work. Allow the exhaust system to cool before inspection or repair.

2. Inspect and Replace Catalytic Converter

1. Lift the Vehicle:

   • Use a hydraulic lift or jack stands to elevate the vehicle securely.

2. Remove Exhaust Heat Shield (if applicable):

   • Locate and unbolt the heat shield covering the catalytic converter. Use a socket set for this task.

3. Disconnect Exhaust Components:

   • Identify the flanges connecting the catalytic converter to the exhaust system. Use a socket set to remove the bolts. Carefully detach any hangers or clamps.

4. Remove the Catalytic Converter:

   • Once disconnected, carefully remove the catalytic converter from the vehicle's exhaust system.

5. Inspect and Clean:

   • Inspect the mounting surfaces for any debris or damage. Clean surfaces with a wire brush to ensure a proper seal for the new catalytic converter.

6. Install New Catalytic Converter:

   • Position the new catalytic converter in place. Reattach the exhaust components and ensure all bolts are tightened to the manufacturer's specified torque.

3. Replace Oxygen Sensors (if required)

1. Locate Oxygen Sensors:

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

2. Unplug and Remove Sensors:

   • Carefully disconnect the wiring harness from the sensors and use a socket wrench to remove them.

3. Install New Oxygen Sensors:

   • Apply anti-seize compound to the threads of the new sensors and install them in the same location. Ensure they are tightened to the manufacturer's specifications.

4. Reconnect Battery and Clear Codes

1. Reconnect the Battery:

   • Securely connect the battery terminals.

2. Clear Error Codes:

   • Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.