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

high

Severity

Error Code: P0171

4 min read

635 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 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 working on electrical systems.
•Allow the engine to cool before opening any components related to the intake or fuel system.

Symptoms

•Check engine light illuminated
•Rough idle or stalling
•Poor acceleration or loss of power
•Decreased fuel economy
•Unusual engine noises (e.g., backfiring)
•Increased emissions during an emissions test

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0171 code and check for additional codes.
2
Inspect the air intake system for leaks, including hoses and the intake manifold.
3
Check the Mass Air Flow (MAF) sensor for functionality and cleanliness.
4
Inspect fuel system components, including the fuel pump, fuel filter, and fuel pressure regulator.
5
Verify the operation of the oxygen sensors (O2 sensors) before and after the catalytic converter.
6
Check for vacuum leaks around throttle body, intake manifold, and vacuum lines.

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
•Socket set
•Screwdriver set
•Vacuum gauge
•MAF cleaner
•Soft cloth
•Fuel pressure gauge
•O2 sensor socket

Parts Required

•Mass Air Flow (MAF) sensor (if faulty)
•Fuel filter (if clogged)
•Oxygen sensors (if faulty)
•Vacuum hoses (if damaged)

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm the P0171 code and check for additional codes.
2
Inspect the air intake system for leaks, including hoses and the intake manifold.
3
Check the Mass Air Flow (MAF) sensor for functionality and cleanliness.
4
Inspect fuel system components, including the fuel pump, fuel filter, and fuel pressure regulator.
5
Verify the operation of the oxygen sensors (O2 sensors) before and after the catalytic converter.
6
Check for vacuum leaks around throttle body, intake manifold, and vacuum lines.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to prevent electrical shorts.
Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

Tools Required: Socket set, screwdriver, vacuum gauge
Remove the air intake duct and visually inspect for cracks or loose connections.
Use a vacuum gauge to check for leaks. If found, replace damaged hoses or seals.

3. Clean or Replace MAF Sensor

Tools Required: MAF cleaner, soft cloth
Remove the MAF sensor from the air intake tube.
Clean the sensor with MAF cleaner and a soft cloth. Allow it to dry completely before reinstallation.
If the sensor is faulty, replace it with a new one.

4. Check and Replace Fuel System Components

Tools Required: Fuel pressure gauge, socket set
Connect a fuel pressure gauge to the fuel rail and check for proper fuel pressure (usually 30-45 psi for F-150).
If the pressure is low, inspect the fuel pump and replace it if necessary. Also, consider replacing the fuel filter if it's clogged.

5. Inspect and Replace O2 Sensors (if needed)

Tools Required: O2 sensor socket, wrench
Identify the O2 sensors' locations (pre-catalytic converter and post-catalytic converter).
Disconnect the electrical connectors and remove the O2 sensors.
Install new O2 sensors and reconnect the electrical connectors.

6. Clear Codes and Test Drive

Reconnect the negative battery terminal.
Use the OBD-II scanner to clear the P0171 code.
Start the engine and perform a test drive to ensure the issue is resolved.