how to fix the 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 necessary tools and parts.
• Ensure the vehicle is parked on a flat surface.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Tools Required: Vacuum gauge, flashlight
• Sub-steps:
  1. Visually inspect all intake hoses for cracks or loose fittings.
  2. Use a vacuum gauge to check for leaks in the intake manifold.
  3. Tighten or replace any damaged hoses or connections as needed.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Sub-steps:
  1. Locate the MAF sensor in the air intake path.
  2. Disconnect the electrical connector and remove the sensor using a screwdriver.
  3. Clean the sensor with MAF cleaner and let it dry completely.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Test and Repair Fuel System

• Tools Required: Fuel pressure gauge, multimeter
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail and turn the ignition to the ON position (do not start the engine).
  2. Check the fuel pressure against the manufacturer's specifications.
  3. If pressure is low, check the fuel pump and fuel filter for issues.
  4. Replace the fuel filter if clogged and the fuel pump if defective.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaner kit, socket set
• Sub-steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Clean the injectors using an injector cleaning kit as per the manufacturer's instructions.
  3. Reinstall the cleaned injectors and ensure they are securely fastened.