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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle's battery to prevent electrical shorts during repair.
• Allow the engine to cool down if it has recently been running.

2. Inspect Air Intake System

• Remove the engine cover if applicable.
• Visually inspect all vacuum hoses connected to the intake manifold for cracks or loose connections.
• Check the intake manifold gasket for any signs of leaks.
• Replace any damaged hoses or gaskets.

3. Clean the MAF Sensor

• Locate the MAF sensor in the air intake duct.
• Carefully disconnect the electrical connector from the MAF sensor.
• Remove the MAF sensor from its housing using a Torx or socket wrench.
• Clean the sensor with MAF cleaner spray, avoiding contact with the sensor element.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• 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 specified fuel pressure range.
• If the pressure is low, inspect the fuel pump and filter for issues, replacing if necessary.

5. Inspect Fuel Injectors

• Remove the fuel rail assembly if necessary to access the injectors.
• Inspect the injectors for any leaks or clogs; clean or replace as needed.
• Ensure the electrical connectors to the injectors are secure.

6. Reassemble and Test

• Reinstall any components that were removed during the repair.
• Reconnect the battery.
• Start the engine and allow it to idle for a few minutes to check for any issues.