how to fix P0171 code in Tesla Model S Plaid/Refresh (2021-present)

Learn how to diagnose and fix P0171 engine lean condition in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and necessary parts.
• Disconnect the vehicle battery to ensure safety while working on electronic components.

2. Inspect Air Intake System

• Remove the air intake duct.
• Check for cracks or loose connections in hoses.
• Replace any damaged or loose components.
• Reattach the air intake duct securely.

3. Clean MAF Sensor

• Locate the MAF sensor in the air intake system.
• Use MAF cleaner to spray the sensor, avoiding contact with the sensor elements.
• Allow the sensor to dry completely before reinstallation.

4. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "on" position without starting the engine and observe the pressure reading.
• If the pressure is below specifications (check manufacturer’s specifications), inspect the fuel pump and filter for issues.

5. Inspect Oxygen Sensors

• Locate the upstream oxygen sensor using vehicle service manual for guidance.
• Test the sensor using a multimeter to ensure it operates within specifications.
• Replace if readings are out of range.

6. Clear Codes and Test Drive

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0171 code.
• Start the engine and take the vehicle for a test drive to ensure the issue is resolved.