how to fix the P0171 code in Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.

Tools Required:

• OBD-II scanner
• Fuel pressure gauge
• Socket set
• Torque wrench
• MAF cleaner
• Multimeter

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Disconnect the negative battery terminal to ensure safety.
  2. Remove the air intake duct to access the throttle body.
  3. Visually inspect all hoses and connections for leaks or cracks.
  4. Replace any damaged hoses or gaskets.
  5. Reassemble the air intake duct and reconnect the battery.

3. Check and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor on the air intake system.
  2. Disconnect the wiring harness from the MAF sensor.
  3. Carefully remove the MAF sensor using the appropriate socket.
  4. Clean the sensor with MAF cleaner and allow it to dry.
  5. Reinstall the sensor and reconnect the wiring harness.

4. Test and Repair Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start) to check fuel pressure.
  3. If the pressure is below specifications, inspect the fuel pump and filter for issues.
  4. Replace the fuel filter if clogged, and test the fuel pump operation.
  5. Reconnect everything after repairs.

5. Verify Oxygen Sensor Function

• Sub-steps:
  1. Use a multimeter to check the voltage output of the oxygen sensor while the engine is running.
  2. If the voltage is consistently low or not fluctuating, replace the oxygen sensor.
  3. Reconnect all components after verification.