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Home/Cars/Ford/F-150/Fourteenth Generation (2021-present)/how to fix P0174 code in Ford F-150 Fourteenth Generation (2021-present)

how to fix P0174 code in Ford F-150 Fourteenth Generation (2021-present)

Ford F-150 Fourteenth Generation (2021-present)

Severity: highDifficulty: mediumError Code: P01742-4 hours
3 min read
573 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

Learn how to diagnose and fix P0174 lean air-fuel mixture issue in Ford F-150. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0174
Component
Engine
Repair Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical components.
  • ⚠Allow the engine to cool down before inspecting or working on the intake and exhaust systems.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or stalling
  • •Loss of power during acceleration
  • •Decreased fuel efficiency
  • •Increased engine noise or backfiring

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm the P0174 code.
  2. 2Inspect the engine air intake system for leaks or cracks, including hoses and the intake manifold.
  3. 3Check the fuel pressure using a fuel pressure gauge to ensure it is within specifications.
  4. 4Inspect the Mass Air Flow (MAF) sensor for dirt or damage; clean or replace if necessary.
  5. 5Examine the exhaust system for any restrictions or leaks that could affect air-fuel mixture.
  6. 6Review the vehicle's fuel trim data to assess the long-term fuel trim readings.

Solution

Solution

1. Preparation

  • Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, socket set, torque wrench, MAF sensor cleaner, vacuum gauge.
  • Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Vacuum Leaks

  1. Perform a visual inspection of all vacuum hoses and connections for wear or disconnection.
  2. Use a vacuum gauge to check for any significant drops in vacuum pressure indicating leaks.
  3. If leaks are found, replace damaged hoses or reattach loose connections.

3. Fuel System Inspection

  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine and check the pressure reading.
    • Specification: Consult the service manual for the correct fuel pressure value.
  3. If the pressure is low, inspect the fuel pump and filter for blockages or failures.
  4. Replace the fuel filter if clogged, and consider replacing the fuel pump if it fails to deliver the correct pressure.

4. MAF Sensor Service

  1. Disconnect the MAF sensor connector.
  2. Remove the MAF sensor from the air intake duct.
  3. Clean the MAF sensor with MAF cleaner and let it dry.
  4. Reinstall the MAF sensor and reconnect the wiring harness.

5. Reset and Test

  1. Reconnect the negative battery terminal.
  2. Clear the P0174 code using the OBD-II scanner.
  3. Start the engine and allow it to reach operating temperature.
  4. Take the vehicle for a test drive to see if the check engine light returns.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Fuel pressure gauge
  • Multimeter
  • Socket set
  • Torque wrench
  • MAF sensor cleaner
  • Vacuum gauge

Parts Required

  • Fuel filter (if clogged)
  • Fuel pump (if defective)
  • Vacuum hoses (if damaged)

Additional Information

Error CodeP0174
Component

Engine

Repair Time

2-4 hours

Difficulty

medium

Severity

high

Tools

7 items

Parts

3 items

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