how to fix P0171 lean condition code in Tesla Outback 4th Generation (2010-2014)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect Intake System for Leaks

• Use a smoke tester or carburetor cleaner to check for vacuum leaks.
• Inspect all vacuum hoses for cracks or disconnections.
• If leaks are found, replace damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Remove the MAF sensor from the air intake duct.
• Use MAF cleaner to spray the sensor element, ensuring not to touch it directly.
• Allow the sensor to dry completely.
• Reinstall the MAF sensor securely.

4. Test Fuel Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine and check the pressure.
• Compare the reading with manufacturer specifications; it should typically be around 50-60 psi.
• If pressure is low, check the fuel pump and filter for issues.

5. Inspect and Clean Fuel Injectors

• Remove the fuel injectors from the engine.
• Use an ultrasonic cleaner or fuel injector cleaner to clean them thoroughly.
• Test the injectors for proper spray pattern and flow rates using a fuel injector tester.

6. Check ECT Sensor

• Locate the ECT sensor and use a multimeter to check its resistance against temperature specifications.
• If the readings are out of range, replace the ECT sensor.