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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool completely.

2. Inspect and Replace Vacuum Hoses

1. Visual Inspection:
   • Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
2. Replace Damaged Hoses:
   • If any hose is damaged, remove it and replace it with a new hose of the same diameter.
   • Ensure all connections are secure.

3. Clean or Replace MAF Sensor

1. Remove MAF Sensor:
   • Disconnect the electrical connector from the MAF sensor.
   • Use a Torx screwdriver to remove the MAF sensor from the air intake.
2. Clean MAF Sensor:
   • Spray MAF cleaner on the sensor elements without touching them.
   • Allow it to dry completely before reinstalling.
3. Replace if Necessary:
   • If the sensor is damaged or cleaning does not resolve the issue, replace it with a new MAF sensor.

4. Check and Adjust Fuel Pressure

1. Connect Fuel Pressure Gauge:
   • Locate the fuel rail and connect the fuel pressure gauge to the test port.
2. Test Pressure:
   • Turn the ignition to the "ON" position without starting the engine and check the pressure reading.
   • Compare the reading to the manufacturer’s specifications (typically around 50-60 psi).
3. Replace Fuel Pump/Regulator if Low:
   • If the pressure is lower than specified, replace the fuel pump or fuel pressure regulator as necessary.

5. Clear Error Codes and Test Drive

1. Clear Codes:
   • Use the OBD-II scanner to clear the P0171 code.
2. Test Drive:
   • Drive the vehicle under various conditions to ensure the issue is resolved.