how to fix P0174 code in Ford F-150 12th Generation (2009-2014)

Solution

1. Preparation

• Gather the necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to detect leaks. Apply it around suspected areas; a change in engine RPM indicates a leak.
  3. Replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor, typically near the air filter in the intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Use MAF sensor cleaner to spray the sensor. Avoid touching the sensor element.
  4. Allow it to dry completely before reinstalling.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position without starting the engine and check the pressure reading.
  3. If the pressure is below specifications, inspect the fuel pump and fuel filter for issues. Replace if necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Disconnect the fuel injector connectors.
  2. Use a noid light to check for injector pulse.
  3. If there's no pulse, further inspect the wiring and engine control module (ECM).
  4. If pulse is present, use a cleaning kit to clean injectors or replace them if clogged.