how to solve P0171 lean code in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during the repair.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hoses for cracks or disconnections.
  2. If leaks are found, replace the affected hoses.
  3. Ensure the air filter is clean; replace if dirty.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Remove the MAF sensor carefully using a Torx screwdriver.
  3. Clean the sensor with MAF cleaner spray; avoid touching the sensor elements.
  4. Reinstall the MAF sensor and ensure it is securely connected.

4. Test Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition on without starting the engine to check the pressure reading.
  3. Compare the reading with the manufacturer's specifications (typically around 30-50 psi).
  4. If pressure is low, check the fuel pump and filter for clogs or failure.

5. Inspect and Test Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from the sensors.
  3. Use a multimeter to test the voltage output of the upstream O2 sensor (should fluctuate between 0.1V and 0.9V).
  4. Replace any faulty sensors.

6. Verify Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail assembly to access the fuel injectors.
  2. Inspect the injectors for any signs of clogging or leaking.
  3. If necessary, clean or replace injectors as per manufacturer's guidelines.