how to fix P0171 code on Ford F-150 13th Generation (2015-2020)

Learn how to diagnose and fix P0171 engine lean condition in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver, vacuum gauge
• Remove the air intake duct and visually inspect for cracks or loose connections.
• Use a vacuum gauge to check for leaks. If found, replace damaged hoses or seals.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, soft cloth
• Remove the MAF sensor from the air intake tube.
• Clean the sensor with MAF cleaner and a soft cloth. Allow it to dry completely before reinstallation.
• If the sensor is faulty, replace it with a new one.

4. Check and Replace Fuel System Components

• Tools Required: Fuel pressure gauge, socket set
• Connect a fuel pressure gauge to the fuel rail and check for proper fuel pressure (usually 30-45 psi for F-150).
• If the pressure is low, inspect the fuel pump and replace it if necessary. Also, consider replacing the fuel filter if it's clogged.

5. Inspect and Replace O2 Sensors (if needed)

• Tools Required: O2 sensor socket, wrench
• Identify the O2 sensors' locations (pre-catalytic converter and post-catalytic converter).
• Disconnect the electrical connectors and remove the O2 sensors.
• Install new O2 sensors and reconnect the electrical connectors.

6. Clear Codes and Test Drive

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code.
• Start the engine and perform a test drive to ensure the issue is resolved.