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

Solution

1. Preparation

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

2. Inspect and Replace Vacuum Lines

• Tools Required: Pliers, replacement vacuum lines
• Identify any vacuum lines that show signs of wear or damage.
• Remove the defective vacuum lines using pliers.
• Install new vacuum lines, ensuring a secure fit.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Locate the MAF sensor in the air intake system.
• Remove the MAF sensor using the screwdriver.
• If dirty, clean the MAF sensor with MAF sensor cleaner; if faulty, replace with a new sensor.
• Reinstall the MAF sensor securely.

4. Inspect Fuel Pressure and Injectors

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "on" position without starting the engine to check fuel pressure.
• If pressure is low, inspect the fuel pump and filter for issues; replace as necessary.
• If injectors are clogged, clean or replace them.

5. Inspect Air Intake System

• Tools Required: Socket set, flashlight
• Check the air intake duct and throttle body for any obstructions or leaks.
• Tighten or replace any loose or damaged components.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0174 code from the ECM.