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Home/Cars/Ford/F-150/14th Generation (2021-2024)/how to fix P0171 code in Ford F-150 14th Generation (2021-2024)

how to fix P0171 code in Ford F-150 14th Generation (2021-2024)

Ford F-150 14th Generation (2021-2024)

Error Codes
Severity: highDifficulty: mediumError Code: P01712-4 hours
3 min read
557 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 P0171 fuel system issue in Ford F-150 14th generation. Step-by-step guide with diagnostic procedures and repair instructions.

Error Code
P0171
Affected Component
Fuel System
Estimated Time
2-4 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical systems.
  • ⚠Allow the engine to cool before inspecting or working on the fuel system.

Symptoms

  • •Check engine light illuminated
  • •Rough idle
  • •Loss of power during acceleration
  • •Poor fuel economy
  • •Engine stalling at low RPMs
  • •Unusual exhaust odor (lean condition)

Diagnostic Steps

  1. 1Scan for error codes using an OBD-II scanner to confirm P0171 and check for any related codes.
  2. 2Inspect the air intake system for leaks, cracks, or loose connections.
  3. 3Check the Mass Air Flow (MAF) sensor for contamination or malfunction.
  4. 4Inspect fuel pressure using a fuel pressure gauge to ensure it meets specifications.
  5. 5Examine the fuel injectors for clogs or leaks.
  6. 6Check vacuum hoses for cracks or disconnections that may lead to a lean condition.
  7. 7Inspect the exhaust system for leaks before the oxygen sensors.

Solution

Solution

1. Preparation

  • Gather tools and parts necessary for the repair.
  • Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Repair Air Intake System

  • Sub-steps:
    • Visually inspect the air intake duct for cracks or loose fittings.
    • Tighten any loose clamps or fittings.
    • Replace damaged air intake components if necessary.

3. Clean or Replace MAF Sensor

  • Sub-steps:
    • Remove the MAF sensor from the air intake system.
    • Clean the MAF sensor with MAF sensor cleaner; do not use other cleaners.
    • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check and Adjust Fuel Pressure

  • Sub-steps:
    • Connect a fuel pressure gauge to the fuel rail.
    • Turn the ignition key to the "On" position (do not start) to check fuel pressure.
    • If pressure is below the specified range, check the fuel pump and filter.
    • Replace the fuel filter and pump if necessary.

5. Inspect and Clean Fuel Injectors

  • Sub-steps:
    • Remove the fuel injectors from the intake manifold.
    • Use an ultrasonic cleaner or fuel injector cleaner to clean injectors.
    • Reinstall cleaned or new injectors ensuring proper sealing to prevent leaks.

6. Check Vacuum Hoses

  • Sub-steps:
    • Inspect all vacuum hoses for cracks or damage.
    • Replace any damaged vacuum hoses.
    • Reconnect all hoses securely.

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
  • •Socket set
  • •Torque wrench
  • •MAF sensor cleaner
  • •Ultrasonic cleaner (optional)

Parts Required

  • •MAF sensor (if replacement is necessary)
  • •Fuel filter (if replacement is necessary)
  • •Fuel injectors (if cleaning does not resolve issues)
  • •Vacuum hoses (if damaged)

Additional Information

Error Code
P0171
Affected Component
Fuel System
Estimated Time
2-4 hours
Difficulty
medium
Severity
high
Tools Required
6 items
Parts Required
4 items

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