how to diagnose P0171 code on Tesla Outback 6th Generation (2020-2024)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine to detect any hidden vacuum leaks.
  3. Replace any damaged hoses or seals.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the intake duct by unscrewing the mounting screws.
  2. Spray MAF cleaner on the sensor element (do not touch the sensor with fingers).
  3. Allow the sensor to dry completely before reinstallation.
  4. Reinstall the MAF sensor and secure it with screws.

4. Test Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition key to the ON position (do not start the engine) and check the pressure reading.
  3. Compare the reading to the manufacturer’s specified fuel pressure range.
  4. If pressure is low, check the fuel pump and filter for clogs or failures.

5. Inspect and Clean Throttle Body

• Sub-steps:
  1. Remove the air intake duct from the throttle body.
  2. Use throttle body cleaner and a soft cloth to clean the throttle plate and bore.
  3. Ensure that the throttle plate opens and closes smoothly.
  4. Reassemble all components after cleaning.