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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure vehicle is parked on a level surface and set to 'Park'.
• Disconnect the negative terminal of the battery for safety.

2. Inspect Intake System

• Tools Required: Screwdriver set, flashlight.
• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Remove and inspect the intake manifold gaskets for wear.
  3. Replace any damaged hoses or gaskets as necessary.

3. Check Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Start the vehicle and check the pressure reading against specification.
  3. If pressure is low, investigate the fuel pump and fuel filter for issues.

4. Clean MAF Sensor

• Tools Required: MAF cleaner spray, soft brush.
• Sub-steps:
  1. Disconnect the MAF sensor from the intake duct.
  2. Spray the MAF cleaner onto the sensor elements and let it dry completely.
  3. Reinstall the MAF sensor securely.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaner kit (if required).
• Sub-steps:
  1. Remove the fuel injector connectors and unscrew the injectors.
  2. Inspect for dirt or blockage; clean using an injector cleaner if necessary.
  3. Reinstall the injectors ensuring proper sealing.

6. Test Drive

• After repairs, reconnect the battery terminal.
• Start the vehicle and monitor for any reoccurring codes or symptoms.