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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses and connections for cracks or disconnections.
  • Use a smoke machine to identify hard-to-find leaks.
  • Replace any damaged hoses or seals.
• Tools Required: Smoke machine (optional), hose clamp pliers.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Spray MAF cleaner on the sensor elements; do not touch them.
  • Allow the sensor to dry completely before reinstalling.
• Tools Required: Torx screwdriver.
• Safety Warnings: Ensure the engine is off and cool to prevent burns.

4. Check and Clean the Throttle Body

• Sub-steps:
  • Remove the throttle body from the intake manifold.
  • Use throttle body cleaner and a soft cloth to clean the inside of the throttle body.
  • Reinstall the throttle body with the manufacturer's torque specifications.
• Tools Required: Socket set, torque wrench.
• Safety Warnings: Disconnect battery before removing electrical connections.

5. Test Fuel Pressure and Inspect Fuel Injectors

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail test port.
  • Turn the ignition to the ON position without starting the engine and check for correct fuel pressure.
  • If pressure is low, inspect the fuel pump and filter; replace if necessary.
  • Check fuel injectors for proper operation and clean or replace as needed.
• Tools Required: Fuel pressure gauge, injector cleaning kit (if necessary).