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

Solution

1. Preparation

• Gather necessary tools and parts. Ensure the vehicle is parked on a flat surface and the engine is cool.
• Tools Required: OBD-II scanner, fuel pressure gauge, socket set, MAF cleaner, vacuum gauge, safety glasses, gloves.

2. Inspect and Repair Air Intake System

• Sub-step 1: Visually inspect the air intake hoses and connections for any signs of wear, cracks, or disconnections. Replace any damaged hoses.
• Sub-step 2: Remove the air filter and inspect it for cleanliness; replace if necessary.
• Sub-step 3: Check the intake manifold gasket for leaks and replace if needed.

3. Fuel System Check

• Sub-step 1: Connect the fuel pressure gauge to the fuel rail and turn the ignition to the "ON" position without starting the engine.
• Sub-step 2: Compare the fuel pressure reading with the specifications provided in the service manual (typically between 55-65 psi for the F-150).
• Sub-step 3: If the pressure is low, inspect the fuel pump and fuel filter for clogs or failures, and replace as necessary.

4. Clean the MAF Sensor

• Sub-step 1: Disconnect the MAF sensor electrical connector.
• Sub-step 2: Remove the MAF sensor from the air intake duct.
• Sub-step 3: Spray MAF cleaner on the sensing elements and allow it to dry completely before reinstalling.

5. Inspect Vacuum Lines

• Sub-step 1: Check all vacuum lines connected to the intake manifold for cracks or loose connections.
• Sub-step 2: Use a vacuum gauge to test for proper vacuum levels; replace any damaged hoses.

6. Test and Replace Oxygen Sensors (if necessary)

• Sub-step 1: Use an OBD-II scanner to monitor the oxygen sensor readings while the engine is running.
• Sub-step 2: If the readings are erratic or outside of expected parameters, replace the affected oxygen sensor.