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

Solution

1. Preparation

• Gather tools and parts before starting the repair.
• Ensure the vehicle is parked on a level surface and the ignition is off.
• Disconnect the battery to prevent any electrical issues.

2. Inspect Air Intake System

• Sub-steps:
  • Remove the engine cover if necessary.
  • Inspect all air intake hoses and connections for cracks, loose fittings, or signs of wear.
  • Replace any damaged hoses or clamps.

3. Test and Clean MAF Sensor

• Sub-steps:
  • Locate the MAF sensor on the air intake duct.
  • Disconnect the MAF sensor electrical connector.
  • Remove the MAF sensor using a Torx or socket wrench.
  • Clean the sensor using MAF cleaner spray.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail’s test port.
  • Turn the ignition to the "ON" position without starting the engine and check the fuel pressure reading.
  • Compare the reading to the manufacturer’s specifications (usually between 40-60 psi).
  • If pressure is low, check the fuel pump and filter for issues.

5. Inspect Oxygen Sensors

• Sub-steps:
  • Locate the upstream and downstream oxygen sensors on the exhaust system.
  • Use an O2 sensor socket to remove the sensors.
  • Inspect for any contaminants or damage.
  • Replace any faulty sensors with new ones.

6. Check Fuel Injectors

• Sub-steps:
  • Remove the fuel rail to access the injectors.
  • Inspect each injector for clogs or leaks.
  • Clean or replace any malfunctioning injectors as necessary.