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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all intake hoses and connections for cracks or wear.
  2. Replace any damaged hoses or gaskets.
  3. Ensure the air filter is clean and properly seated.

3. Check and Clean MAF Sensor

• Tools Required: MAF cleaner, screwdriver, safety glasses.
• Sub-steps:
  1. Disconnect the MAF sensor harness carefully.
  2. Remove the MAF sensor from the housing using the screwdriver.
  3. Spray the MAF cleaner on the sensor and allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the harness.

4. Test Fuel System

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "on" position without starting the engine and check the pressure reading; it should meet manufacturer specifications (typically 40-50 PSI).
  3. If pressure is low, inspect the fuel pump and fuel filter for issues.

5. Inspect and Test Fuel Injectors

• Tools Required: Multimeter, injector tester (if available).
• Sub-steps:
  1. Disconnect the fuel injector connectors.
  2. Use the multimeter to check the resistance of each injector; it should typically be between 12-16 ohms.
  3. If any injectors are faulty, replace them.

6. Verify Oxygen Sensor Functionality

• Tools Required: Multimeter.
• Sub-steps:
  1. Locate the oxygen sensor and disconnect it.
  2. Use the multimeter to check the voltage output; it should fluctuate between 0.1V to 0.9V.
  3. Replace the sensor if it does not meet specifications.