how to fix the P0171 code in my Ford F-150 13th Generation (2015-2020)

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

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0171

3 min read

571 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 (2015-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Error Code

P0171

Affected Component

Fuel System

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before performing any repairs on the intake or fuel systems.

Symptoms

•Check engine light illuminated
•Rough idle
•Decreased acceleration performance
•Poor fuel economy
•Engine stalling during low-speed operation
•Increased emissions

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0171 code and check for any additional codes.
2
Inspect the air intake system for vacuum leaks, including hoses and gaskets.
3
Check the mass air flow (MAF) sensor for dirt or damage.
4
Inspect the fuel system, including fuel pressure and fuel filter condition.
5
Check the PCV (positive crankcase ventilation) system for blockages or leaks.
6
Examine the throttle body for carbon buildup.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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
•Throttle body cleaner
•Fuel pressure gauge
•Screwdriver set
•Wrench set
•Pliers

Parts Required

•Fuel filter (if needed)
•PCV valve (if needed)
•Any damaged vacuum hoses

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0171 code and check for any additional codes.
2
Inspect the air intake system for vacuum leaks, including hoses and gaskets.
3
Check the mass air flow (MAF) sensor for dirt or damage.
4
Inspect the fuel system, including fuel pressure and fuel filter condition.
5
Check the PCV (positive crankcase ventilation) system for blockages or leaks.
6
Examine the throttle body for carbon buildup.

Solution

1. Preparation

Gather tools and parts.
Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Vacuum Leaks

Tools Required: Vacuum gauge, hose clamps, screwdriver set
Inspect all vacuum hoses for cracks or disconnections.
Use a vacuum gauge to test the intake manifold for leaks.
Replace any damaged hoses or tighten loose connections.

3. Clean the MAF Sensor

Tools Required: MAF sensor cleaner, soft cloth
Remove the MAF sensor from the air intake duct.
Spray the MAF sensor with MAF cleaner and allow it to dry completely.
Reinstall the MAF sensor ensuring it is securely connected.

4. Check Fuel System

Tools Required: Fuel pressure gauge, wrench set
Connect the fuel pressure gauge to the fuel rail.
Turn the ignition on (do not start) and check the fuel pressure.
If pressure is below specifications, inspect the fuel pump and replace the fuel filter if necessary.

5. Inspect the PCV System

Tools Required: Pliers, replacement PCV valve (if necessary)
Locate the PCV valve and disconnect it from the intake manifold.
Inspect the valve for blockage; if it is clogged or malfunctioning, replace it.

6. Clean the Throttle Body

Tools Required: Throttle body cleaner, soft cloth
Remove the air intake duct to access the throttle body.
Use throttle body cleaner and a cloth to clean carbon deposits around the throttle plate.
Reassemble the air intake duct and ensure all connections are secure.