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

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

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0171

4 min read

621 words

Problem Statement

Learn how to diagnose 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

Important safety information - read before proceeding

•Disconnect the battery before starting any electrical work.
•Always wear safety goggles and gloves when working with fuel systems.

Symptoms

•Check engine light illuminated
•Rough idle
•Loss of power during acceleration
•Poor fuel economy
•Engine stalling during low-speed maneuvers
•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 engine air intake system for vacuum leaks, including hoses and gaskets.
3
Check the Mass Air Flow (MAF) sensor for dirt, damage, or malfunction and clean it if necessary.
4
Inspect the fuel system components, including the fuel filter and fuel injectors, for clogs or failures.
5
Verify the operation of the fuel pressure regulator and check fuel pressure with a gauge.
6
Examine the throttle body for carbon buildup or obstruction.

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
•Fuel pressure gauge
•Torque wrench
•Cleaning supplies (MAF cleaner, rags)

Parts Required

•Vacuum hoses (if damaged)
•Fuel filter
•Fuel injectors (if faulty)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

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 engine air intake system for vacuum leaks, including hoses and gaskets.
3
Check the Mass Air Flow (MAF) sensor for dirt, damage, or malfunction and clean it if necessary.
4
Inspect the fuel system components, including the fuel filter and fuel injectors, for clogs or failures.
5
Verify the operation of the fuel pressure regulator and check fuel pressure with a gauge.
6
Examine the throttle body for carbon buildup or obstruction.

Solution

1. Preparation

Tools Needed:
- OBD-II scanner
- Vacuum gauge
- Fuel pressure gauge
- Torque wrench
- Cleaning supplies (MAF cleaner, rags)
Safety Warnings:
- Disconnect the battery before starting any electrical work.
- Always wear safety goggles and gloves when working with fuel systems.

2. Inspect and Repair Vacuum Leaks

Check all vacuum hoses for cracks or disconnections.
Replace any damaged hoses or gaskets.
Use a vacuum gauge to confirm proper vacuum levels; if low, investigate further.

3. Clean or Replace the MAF Sensor

Carefully remove the MAF sensor from the air intake.
Use MAF sensor cleaner to spray and gently clean the sensor.
Allow it to dry completely before reinstalling.
Reinstall the MAF sensor and ensure it is properly connected.

4. Check and Repair Fuel System Components

Fuel Filter: Replace the fuel filter if it’s clogged or hasn’t been changed as per the maintenance schedule.
Fuel Injectors: Remove and clean the fuel injectors with a cleaning kit if they are dirty. If they are faulty, replace them.

5. Verify Fuel Pressure

Connect a fuel pressure gauge to the fuel rail.
Turn the ignition to the "on" position without starting the engine and note the pressure reading.
Compare the reading to the manufacturer specifications (typically around 55-65 psi for the F-150). If low, check fuel pump operation.

6. Inspect the Throttle Body

Remove the throttle body from the intake manifold.
Clean the throttle plate and intake ports using throttle body cleaner and a soft brush.
Reinstall the throttle body and torque to the manufacturer's specifications.