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Home/Cars/Ford/F-150/13th Generation (2015-2020)/how to troubleshoot P0171 code on my Ford F-150 13th Generation (2015-2020)

how to troubleshoot P0171 code on my Ford F-150 13th Generation (2015-2020)

Ford F-150 13th Generation (2015-2020)

Error Codes
Severity: highDifficulty: mediumError Code: P01712-4 hours
3 min read
545 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 troubleshoot and fix P0171 engine lean condition in Ford F-150 (2015-2020). Step-by-step guide with diagnostic procedures 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 performing any repairs related to the intake or exhaust system.

Symptoms

  • •Check engine light illuminated
  • •Rough idle or stalling
  • •Decreased fuel economy
  • •Engine hesitation during acceleration
  • •Increased emissions
  • •Possible backfiring or popping sounds from the intake

Diagnostic Steps

  1. 1Scan the vehicle using an OBD-II scanner to confirm the P0171 code and check for any other related codes.
  2. 2Inspect the intake air system for any vacuum leaks, including hoses, gaskets, and connections.
  3. 3Check the Mass Air Flow (MAF) sensor for proper operation and cleanliness.
  4. 4Inspect the fuel system, including fuel pressure, fuel filter, and injectors for proper operation.
  5. 5Examine the exhaust system for any blockages or leaks.
  6. 6Inspect the Engine Coolant Temperature (ECT) sensor for proper function.

Solution

Solution

1. Preparation

  • Gather necessary tools and parts.
  • Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

  • Use a smoke machine or soapy water to identify leaks in the intake system.
  • Tighten or replace any loose or damaged hoses and gaskets as needed.

3. Clean or Replace MAF Sensor

  • Remove the MAF sensor from the air intake duct.
  • Clean the MAF sensor using MAF sensor cleaner.
  • Reinstall the MAF sensor or replace it if it is faulty.

4. Check Fuel System

  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition key to the "ON" position (without starting the engine) to check the fuel pressure against manufacturer specifications (typically around 50-60 PSI).
  • If pressure is low, inspect the fuel pump, filter, and injectors. Replace any faulty components.

5. Inspect Exhaust System

  • Visually inspect the exhaust system for blockages or leaks.
  • Repair or replace any damaged sections of the exhaust.

6. Check ECT Sensor

  • Locate the ECT sensor and check the electrical connector for corrosion or damage.
  • Test the ECT sensor's resistance with a multimeter and compare it with specifications in the service manual. Replace if out of range.

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
  • •Vacuum gauge
  • •MAF sensor cleaner
  • •Fuel pressure gauge
  • •Multimeter
  • •Basic hand tools (sockets, wrenches, screwdrivers)

Parts Required

  • •MAF sensor (if faulty)
  • •Vacuum hoses (if damaged)
  • •Fuel filter (if clogged)
  • •ECT sensor (if faulty)

Additional Information

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

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