how to fix P0171 code in 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

4 min read

604 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 inspecting or working on the fuel system.

Symptoms

•Check engine light illuminated
•Rough idle or stalling
•Loss of power during acceleration
•Poor fuel economy
•Unusual engine noises
•Increased emissions

Diagnostic Steps

1
Scan the vehicle’s onboard computer using an OBD-II scanner to confirm the P0171 code and check for any additional codes.
2
Inspect the air intake system for any leaks, cracks, or loose connections.
3
Check the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
4
Examine the Mass Air Flow (MAF) sensor for dirt or damage, and clean or replace as necessary.
5
Inspect the vacuum lines for any cracks or disconnections that may cause a lean condition.
6
Verify the condition of the fuel injectors for proper operation and cleanliness.

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
•Fuel pressure gauge
•Multimeter
•Socket set
•Torque wrench
•Cleaning spray (MAF cleaner)
•Vacuum pump

Parts Required

•Air filter (if replacement is needed)
•MAF sensor (if cleaning does not resolve the issue)
•Fuel filter (if clogged)
•Vacuum lines (if damaged)
•Fuel injectors (if defective)

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Diagnostic Steps

1
Scan the vehicle’s onboard computer using an OBD-II scanner to confirm the P0171 code and check for any additional codes.
2
Inspect the air intake system for any leaks, cracks, or loose connections.
3
Check the fuel pressure using a fuel pressure gauge to ensure it meets manufacturer specifications.
4
Examine the Mass Air Flow (MAF) sensor for dirt or damage, and clean or replace as necessary.
5
Inspect the vacuum lines for any cracks or disconnections that may cause a lean condition.
6
Verify the condition of the fuel injectors for proper operation and cleanliness.

Solution

1. Preparation

Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, socket set, torque wrench, cleaning spray (MAF cleaner), vacuum pump.
Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Air Intake System

Check the air filter and replace if dirty.
Examine the intake manifold for cracks or leaks and repair as necessary.
Tighten or replace any loose or damaged hoses in the air intake system.

3. Check and Clean MAF Sensor

Remove the MAF sensor from the air intake duct.
Use MAF cleaner to gently spray the sensor elements. Avoid touching them.
Allow the sensor to dry completely before reinstalling.

4. Test and Adjust Fuel Pressure

Connect the fuel pressure gauge to the fuel rail.
Start the engine and monitor the fuel pressure reading. It should be within the manufacturer's specified range (usually between 55-65 PSI).
If the pressure is low, check the fuel pump and fuel filter for issues. Replace components as necessary.

5. Inspect and Replace Vacuum Lines

Visually inspect all vacuum lines leading to the intake manifold.
Replace any cracked or damaged lines with new vacuum hose of the correct diameter.

6. Fuel Injector Service

If fuel injectors are found to be clogged, remove them and clean using an ultrasonic cleaner.
Reinstall the injectors ensuring they are seated properly and connected securely.