how to fix P0174 lean code in my Ford F-150 14th Generation (2021-2024)?

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to find leaks while the engine is running.
  3. Replace any damaged hoses and ensure all connections are secure.
• Tools Required: Smoke machine or carburetor cleaner, basic hand tools.

3. Clean the Mass Air Flow (MAF) Sensor

• Sub-steps:
  1. Locate the MAF sensor, typically found between the air filter and intake manifold.
  2. Detach the electrical connector and remove the MAF sensor from the intake duct.
  3. Use MAF cleaner spray to clean the sensor elements without touching them.
  4. Reinstall the MAF sensor and reconnect the electrical connector.
• Tools Required: MAF cleaner spray, screwdriver set.

4. Check Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition to the "On" position (do not start the engine) to check the static fuel pressure.
  3. Compare the reading to the manufacturer's specifications (usually around 30-40 psi for most F-150 models).
  4. If the pressure is low, inspect the fuel pump, fuel filter, and fuel lines for issues.
• Tools Required: Fuel pressure gauge.

5. Inspect and Replace Faulty Components

• Sub-steps:
  1. Check the fuel injectors for clogs or malfunction.
  2. Replace any faulty injectors or clean them using an injector cleaning kit.
  3. Examine the ECT sensor and replace it if it shows incorrect readings.
• Tools Required: Injector cleaning kit, basic hand tools, multimeter.