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

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

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

Error Codes
Severity: mediumDifficulty: mediumError Code: P01712-4 hours
3 min read
580 words

Problem Statement

Learn how to diagnose and fix P0171 lean code in Ford F-150 14th Generation. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Error Code
P0171
Affected Component
Engine
Estimated Time
2-4 hours

Safety Warnings

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

Symptoms

  • •Check engine light illuminated
  • •Rough idle or stalling
  • •Loss of power during acceleration
  • •Poor fuel economy
  • •Increased emissions
  • •Engine noise (popping or backfiring)

Diagnostic Steps

  1. 1Scan the vehicle using an OBD-II scanner to confirm the P0171 code and check for any additional codes.
  2. 2Inspect the air intake system for leaks, including hoses and the intake manifold.
  3. 3Check the mass air flow (MAF) sensor for contamination or malfunction.
  4. 4Verify fuel pressure with a fuel pressure gauge to ensure the fuel pump and filter are functioning properly.
  5. 5Inspect the fuel injectors for clogs or electrical issues.
  6. 6Check for vacuum leaks in the vacuum lines and intake gaskets.

Solution

Solution

1. Preparation

  • Gather tools and parts needed for the repair.
  • Disconnect the negative battery terminal to ensure safety while working on the electrical components.

2. Inspect and Repair Air Intake System

  • Sub-steps:
    • Visually inspect all air intake hoses for cracks or loose connections.
    • Replace any damaged hoses or clamps.
    • Ensure the air filter is clean; replace it if necessary.

3. Clean or Replace the MAF Sensor

  • Sub-steps:
    • Locate the MAF sensor in the air intake duct.
    • Disconnect the electrical connector and remove the sensor.
    • Clean the sensor with MAF sensor cleaner and let it dry, or replace it if damaged.

4. Check and Adjust Fuel Pressure

  • Sub-steps:
    • Connect a fuel pressure gauge to the fuel rail.
    • Turn the ignition to the "ON" position without starting the engine to check the fuel pump operation.
    • Compare the pressure reading to the manufacturer's specifications (usually between 50-60 psi); replace the fuel pump or filter if pressure is low.

5. Inspect and Clean Fuel Injectors

  • Sub-steps:
    • Disconnect the fuel lines from the injectors.
    • Remove the injectors from the intake manifold.
    • Clean the injectors using an ultrasonic cleaner or replace if clogged or malfunctioning.

6. Check for Vacuum Leaks

  • Sub-steps:
    • Inspect all vacuum lines for cracks or disconnections.
    • Spray carburetor cleaner around suspected leak areas while the engine is idling; listen for changes in engine RPM.
    • Replace any damaged vacuum hoses and reseal intake gaskets as needed.

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
  • •Screwdrivers
  • •MAF sensor cleaner
  • •Ultrasonic cleaner (optional)

Parts Required

  • •Air filter
  • •MAF sensor (if needed)
  • •Fuel pump (if needed)
  • •Fuel filter (if needed)
  • •Fuel injectors (if needed)

Additional Information

Error Code
P0171
Affected Component
Engine
Estimated Time
2-4 hours
Difficulty
medium
Severity
medium
Tools Required
6 items
Parts Required
5 items

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