how to fix P0171 lean code in Tesla Outback 4th Generation (2010-2014)

Solution

1. Preparation

• Gather tools and parts for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Air Intake Components

• Inspect the Intake Hoses:
  • Remove the air intake duct.
  • Check for cracks or loose connections; replace any damaged hoses.
• MAF Sensor Cleaning:
  • Remove the MAF sensor from the air intake.
  • Use MAF sensor cleaner to spray the sensor gently and let it dry before reinstalling.

3. Fuel System Evaluation

• Check Fuel Pressure:
  • Connect the fuel pressure gauge to the fuel rail test port.
  • Turn the ignition to the ON position (without starting) and check the pressure reading against manufacturer specifications (typically around 40-50 psi).
  • If pressure is low, inspect and replace the fuel pump or fuel filter if necessary.
• Inspect Fuel Injectors:
  • Remove the fuel injector connectors and inspect for corrosion or damage.
  • Perform a resistance test on each injector using a multimeter; replace any faulty injectors.

4. Vacuum Leak Repair

• Inspect Vacuum Lines:
  • Visually check all vacuum lines for signs of wear or damage.
  • Replace any broken or disconnected lines.
• Intake Manifold Gasket Check:
  • If a vacuum leak is suspected but not found, remove the intake manifold and inspect the gasket.
  • Replace the gasket if it appears worn or damaged.

5. Final Assembly

• Reinstall any components removed during inspection and repair.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.