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

Solution

1. Preparation

• Tools Required: OBD-II scanner, multimeter, fuel pressure gauge, socket set, vacuum gauge.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air intake hose for cracks or loose fittings.
  2. Tighten or replace any loose or damaged components.
  3. If necessary, clean the MAF sensor using MAF sensor cleaner.
  4. Reconnect any disconnected hoses and ensure all connections are secure.

3. Check Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "On" position without starting the engine and check fuel pressure.
  3. Compare the reading to manufacturer specifications (typically between 40-60 psi).
  4. If pressure is low, inspect the fuel pump, fuel filter, and fuel lines for blockages or malfunctions.
  5. Replace any faulty components as necessary.

4. Inspect and Test Oxygen Sensors

• Sub-steps:
  1. Locate the upstream O2 sensor in the exhaust manifold.
  2. Disconnect the sensor and use a multimeter to test for proper voltage output while the engine is running.
  3. If the output is outside the normal range (0.1-0.9 volts), replace the oxygen sensor.
  4. Reinstall and secure all connections.

5. Clear Codes and Test Drive

• Sub-steps:
  1. Reconnect the battery.
  2. Use the OBD-II scanner to clear the P0171 code.
  3. Take the vehicle for a test drive to ensure the code does not return and monitor performance.