what does it mean if my Tesla Outback has a P0171 code

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Use a smoke machine or carburetor cleaner to identify vacuum leaks around hoses and gaskets.
  2. Replace any damaged or cracked hoses and gaskets found during inspection.
• Tools Required: Smoke machine or carburetor cleaner, hose clamps, socket set.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor, usually found in the air intake duct.
  2. Disconnect the sensor’s electrical connector.
  3. Remove the MAF sensor using a Torx or socket wrench.
  4. Clean the sensor with MAF cleaner; avoid touching the sensor element.
  5. Reinstall the sensor and reconnect the electrical connector.
• Tools Required: Torx or socket wrench, MAF cleaner.

4. Test Fuel Pressure

• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition key to the "On" position (do not start the engine) and check the pressure reading against the manufacturer’s specifications.
  4. If the pressure is low, check the fuel pump and filter for issues.
• Tools Required: Fuel pressure gauge.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the engine cover if applicable to access the fuel injectors.
  2. Inspect each injector for signs of leakage or blockage.
  3. If necessary, clean the injectors with a fuel injector cleaning kit or replace them if they are defective.
• Tools Required: Fuel injector cleaning kit, socket set.