how to fix P0420 code in Tesla Model Y Current (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Raise the vehicle using a hydraulic lift or jack stands.

2. Inspect and Replace Oxygen Sensors

• Sub-step 1: Locate the upstream and downstream oxygen sensors on the exhaust system.
• Sub-step 2: Use a socket wrench to remove the sensors. Ensure you have the correct size oxygen sensor socket.
• Sub-step 3: Install new oxygen sensors, tightening them to manufacturer specifications (usually around 30 lb-ft).
• Tools Required: Oxygen sensor socket, socket wrench, torque wrench.

3. Inspect and Replace Catalytic Converter (if necessary)

• Sub-step 1: Remove the exhaust components connected to the catalytic converter, including any heat shields or clamps.
• Sub-step 2: Carefully detach the catalytic converter from the exhaust system, noting the orientation for reinstallation.
• Sub-step 3: Install the new catalytic converter, ensuring proper alignment and securing it with bolts and clamps.
• Sub-step 4: Reattach any heat shields and exhaust components in reverse order.
• Tools Required: Socket set, wrench set, exhaust clamp tool.

4. Reconnect Battery and Clear Codes

• Sub-step 1: Reconnect the negative battery terminal.
• Sub-step 2: Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer system.
• Sub-step 3: Start the engine and let it run for a few minutes to ensure the check engine light does not return.