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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, MAF cleaner, vacuum gauge.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Remove the air filter and inspect the air intake duct for cracks or looseness.
• Replace any damaged components and ensure all connections are secure.
• Reinstall the air filter.

3. Clean or Replace MAF Sensor

• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the intake manifold.
• Clean the sensor with MAF cleaner; do not touch the sensor elements.
• If cleaning does not resolve the issue, replace the MAF sensor.

4. Test and Adjust Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and check the fuel pressure reading against manufacturer specifications.
• If the pressure is low, inspect the fuel pump and replace if necessary.

5. Inspect and Clean Fuel Injectors

• If fuel pressure is adequate, remove the fuel injectors from the fuel rail.
• Clean the injectors using an ultrasonic cleaner or replace them if they are clogged or damaged.
• Reinstall the injectors and ensure they are properly seated.