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 necessary tools and parts.
• Disconnect the high-voltage battery for safety.
• Ensure the vehicle is on a level surface and secure it with wheel chocks or jack stands.

2. Inspect and Repair Intake System

• Sub-steps:
  1. Visually inspect the intake manifold and throttle body for cracks or loose connections.
  2. Use a smoke machine to detect vacuum leaks in the intake system, if available.
  3. Replace any damaged hoses or gaskets identified during inspection.
• Tools Required: Smoke machine (optional), basic hand tools.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor on the intake tube.
  2. Disconnect the electrical connector and remove the sensor from the housing.
  3. Clean the sensor using MAF sensor cleaner; avoid touching the sensitive wires.
  4. Reinstall the sensor and reconnect the electrical connector.
• Tools Required: MAF sensor cleaner, T20 Torx screwdriver.

4. Test Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn on the ignition without starting the engine and check the fuel pressure reading.
  3. If pressure is below specification, inspect the fuel pump and filter. Replace as necessary.
• Tools Required: Fuel pressure gauge, basic hand tools.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the engine cover to access the fuel injectors.
  2. Check for any signs of fuel leakage around the injectors.
  3. Perform an injector balance test or use a cleaning kit to clean clogged injectors.
• Tools Required: Injector cleaning kit, basic hand tools.