what does error code P0171 mean for my 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 and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shock or shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses and gaskets for signs of wear, cracks, or disconnections.
  2. Replace any damaged hoses or gaskets as needed.
  3. Reconnect all hoses securely.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner or isopropyl alcohol, soft cloth.
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Carefully detach the electrical connector and unscrew the sensor from the duct.
  3. Spray the sensor with MAF cleaner and allow it to dry completely before reinstallation.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge to the test port.
  2. Turn the ignition to the "ON" position without starting the engine and record the pressure reading.
  3. If the pressure is below specifications (consult manufacturer’s specs), inspect and replace the fuel pump if necessary.

5. Inspect and Test Fuel Injectors

• Tools Required: Multimeter, injector cleaning kit (if needed).
• Sub-steps:
  1. Disconnect the electrical connectors from each fuel injector.
  2. Use a multimeter to check the resistance of each injector (refer to specifications).
  3. If any injector is out of range, replace it. If they are all functioning, consider cleaning them using an injector cleaning kit.