how to fix P0171 code in my Ford F-150 14th Generation (2021-2024)

Learn how to diagnose and fix P0171 engine lean condition in Ford F-150 (2021-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect the air intake hoses and connections for cracks or disconnections.
  • If any leaks are found, replace the damaged hoses or reattach loose connections.
  • Check the air filter; if it is dirty or clogged, replace it.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor, usually found between the air filter and throttle body.
  • Disconnect the electrical connector from the MAF sensor.
  • Remove the sensor using a socket set, being careful not to damage it.
  • If cleaning, spray MAF cleaner on the sensor elements and allow it to dry completely. If replacement is necessary, install the new sensor.
  • Reconnect the electrical connector.

4. Check and Repair Fuel System

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail test port.
  • Start the engine and check the fuel pressure; it should meet manufacturer specifications (usually around 30-50 psi).
  • If the pressure is low, inspect the fuel pump and fuel filter; replace as necessary.
  • Ensure that the fuel injectors are functioning correctly; clean or replace if clogged.

5. Inspect Vacuum Lines

• Sub-steps:
  • Visually inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
  • Replace any damaged vacuum hoses.
  • Use a smoke machine to identify any hidden leaks.