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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shock.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Visually inspect all air intake hoses for cracks or disconnections.
• Tighten any loose clamps and replace damaged hoses.
• If the intake manifold gasket is leaking, remove the intake manifold and replace the gasket.

3. Clean or Replace Mass Air Flow (MAF) Sensor

• Tools Required: MAF cleaner, screwdriver
• Remove the MAF sensor from the air intake duct.
• Clean the sensor with MAF cleaner to remove debris.
• If cleaning does not resolve issues, replace the MAF sensor with a new one.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition on (do not start the engine) and read the pressure. It should match the specifications in the service manual.
• If pressure is low, check the fuel filter for clogs and replace if necessary. If the fuel pump is faulty, replace it.

5. Inspect and Replace Oxygen Sensors

• Tools Required: Oxygen sensor socket, wrench
• Inspect the upstream oxygen sensor for function using a scan tool.
• If the sensor is faulty, remove it using the oxygen sensor socket and replace it with a new one.
• Clear the P0171 code from the ECM using an OBD-II scanner after repairs.