how to fix P0171 lean code in my Tesla Outback 6th Generation (2020-2024)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all intake hoses for cracks or loose connections.
  • Tighten or replace any compromised hoses.
  • Clean the air filter if dirty or replace it if necessary.

3. Check and Clean MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Use MAF cleaner to clean the sensor element carefully.
  • Allow it to dry completely before reinstalling.

4. Test and Repair Fuel System

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Start the engine and monitor the fuel pressure; it should match manufacturer's specifications.
  • If pressure is low, check the fuel pump and filter for blockages or failures.
  • If necessary, replace the fuel filter and/or pump.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  • Remove the fuel injector connectors.
  • Use a multimeter to test the resistance of each injector; replace any that are out of specification.
  • Use an injector cleaning kit to clean the injectors if they are clogged.

6. Verify O2 Sensor Functionality

• Sub-steps:
  • Check the wiring and connectors for the upstream O2 sensor.
  • Use a multimeter to test the sensor's voltage output; replace if it does not respond correctly.