how to fix P0171 lean code in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to avoid any electrical issues while working on the vehicle.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carb cleaner to detect any vacuum leaks while the engine is running.
  3. Replace any damaged hoses or gaskets found during inspection.
  4. Ensure the air filter is clean and replace it if necessary.

3. Check and Clean Mass Air Flow (MAF) Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor from its housing.
  4. Clean the sensor with MAF cleaner spray to remove dirt and debris.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test and Adjust Fuel Pressure

• Sub-steps:
  1. Locate the fuel rail and attach a fuel pressure gauge to the service port.
  2. Turn the ignition to the "On" position (do not start the engine) and check the fuel pressure reading.
  3. Compare the reading with the manufacturer's specifications (generally 40-50 psi).
  4. If the pressure is low, check the fuel pump and replace if necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the engine cover if necessary to access the fuel injectors.
  2. Inspect fuel injectors for any signs of leaks or carbon buildup.
  3. Use a multimeter to test the resistance of each injector (should be between 12-16 ohms).
  4. Clean or replace any faulty injectors as needed.