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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before starting any work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all vacuum lines for cracks or disconnections.
  2. Replace any damaged hoses or gaskets found during inspection.
  3. Reassemble the air intake system and ensure all connections are secure.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Remove the MAF sensor from the air intake ducting.
  2. Use MAF sensor cleaner to gently clean the sensor element, avoiding physical contact.
  3. Allow the sensor to dry completely before reinstalling.
  4. If the sensor is damaged, replace it with a new one.

4. Test and Repair Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start) and check the fuel pressure against specifications.
  3. If pressure is low, check the fuel pump operation and replace if necessary.
  4. Inspect and clean fuel injectors using an appropriate cleaning kit or replace them if they are faulty.

5. Check Oxygen Sensors

• Sub-steps:
  1. Inspect the wiring and connectors of the upstream and downstream oxygen sensors for damage.
  2. Use a multimeter to test sensor operation according to manufacturer specifications.
  3. Replace any faulty sensors.