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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.
• Tools Required: OBD-II scanner, multimeter, fuel pressure gauge, socket set, torque wrench, cleaning spray (MAF cleaner), vacuum gauge.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the engine cover (if applicable) to access the intake manifold.
  2. Inspect the intake manifold gasket for signs of wear or damage; replace if necessary.
  3. Check all vacuum hoses connected to the intake manifold for cracks or disconnections; replace any damaged hoses.
  4. Reattach the intake manifold securely, torqueing bolts to the manufacturer's specifications.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake duct.
  3. Spray MAF cleaner onto the sensor element; do not touch the sensor with your fingers.
  4. Allow the sensor to dry completely before reinstalling.
  5. Reconnect the MAF sensor and ensure it is secure.

4. Test and Repair Fuel Delivery System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (do not start) and check the fuel pressure reading against the manufacturer's specification.
  3. If pressure is low, check the fuel pump, filter, and relay for issues; replace any faulty components.
  4. If pressure is adequate, proceed to check the fuel injectors for proper operation and clean or replace as needed.

5. Reconnect Battery and Clear Codes

• Sub-steps:
  1. Reconnect the battery terminals securely.
  2. Use the OBD-II scanner to clear the P0174 code from the ECM.
  3. Start the engine and allow it to reach operating temperature.