how to fix P0171 code on my Ford F-150 Fourteenth Generation (2021-present)

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

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Tools Required: Hose clamps, screwdriver, vacuum gauge.
• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a vacuum gauge to check for leaks in the intake system.
  3. Replace any damaged hoses or gaskets to eliminate leaks.

3. Check and Replace Fuel System Components

• Tools Required: Fuel pressure gauge, wrench set.
• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position without starting the engine.
  2. Verify that fuel pressure is within specifications (typically around 30-40 PSI).
  3. If fuel pressure is low, inspect the fuel pump, fuel filter, and fuel injectors.
  4. Replace any faulty components to restore proper fuel delivery.

4. Clean MAF Sensor

• Tools Required: MAF cleaner, soft cloth.
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Remove the sensor carefully, ensuring not to touch the sensing element.
  3. Spray MAF cleaner onto the sensor and let it dry completely before reinstalling.

5. Clean Throttle Body

• Tools Required: Throttle body cleaner, soft brush.
• Sub-steps:
  1. Remove the air intake duct to access the throttle body.
  2. Spray throttle body cleaner onto the inside of the throttle body.
  3. Use a soft brush to clean the carbon buildup, then wipe it clean with a cloth.
  4. Reassemble the air intake duct.