how to fix a P0171 code on my Tesla Outback 5th Generation (2015-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all vacuum lines and the intake manifold for cracks or loose connections.
  2. Replace any damaged hoses or seals as necessary.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake housing.
  2. Use a MAF sensor cleaner to spray the sensor elements; do not touch them with your fingers or tools.
  3. Allow it to dry completely before reinstalling.

4. Check Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) and check the fuel pressure against manufacturer specifications; replace the fuel pump if pressure is low.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Clean or replace clogged injectors as necessary.
  3. Reinstall the injectors ensuring proper seals are in place.

6. Replace Oxygen Sensors (if necessary)

• Sub-steps:
  1. Disconnect the wiring harness from the upstream oxygen sensor.
  2. Remove the sensor using an oxygen sensor socket.
  3. Install the new oxygen sensor and reconnect the harness.