how to diagnose P0171 code in Tesla Outback 6th Generation (2020-2024)

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, vacuum gauge, smoke machine.
• Allow the engine to cool before starting work.
• Disconnect the battery to ensure safety.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all hoses connected to the air intake for cracks or loose connections.
  2. Replace any damaged hoses or gaskets.
  3. Reconnect any loose connections securely.

3. Test and Clean MAF Sensor

• Sub-steps:
  1. Carefully remove the MAF sensor from the air intake duct.
  2. Use MAF sensor cleaner to spray the sensor elements; do not touch them with tools or fingers.
  3. Allow it to dry completely before reinstallation.

4. Check Fuel System Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check initial pressure.
  3. Start the engine and observe the pressure; it should be within manufacturer specifications (typically 50-60 psi).
  4. If pressure is low, check the fuel pump and filter for issues.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the fuel injectors.
  2. Visually inspect each injector for leaks or clogs.
  3. Use a multimeter to test injector resistance; replace any injectors outside manufacturer specifications.