how to diagnose 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

medium

Severity

Error Code: P0171

4 min read

632 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 battery before working on electrical systems
•Allow engine to cool before opening any components

Symptoms

•Check engine light illuminated
•Rough idle or stalling
•Decreased engine performance
•Poor fuel economy
•Increased emissions
•Engine hesitation during acceleration

Diagnostic Steps

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
•Multimeter
•Fuel pressure gauge
•Socket set
•Throttle body cleaner
•MAF sensor cleaner

Parts Required

•Replacement vacuum hoses (if needed)
•MAF sensor (if needed)
•Fuel filter (if needed)
•Gaskets for throttle body and exhaust (if needed)

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Solution

1. Preparation

Gather tools and parts needed for repair.
Ensure the vehicle is parked on a flat surface, and the engine is cool.
Disconnect the battery before working on electrical systems.

2. Vacuum Leak Repair

Locate and Repair Leaks:
- Use a smoke machine or carburetor cleaner to identify vacuum leaks.
- Replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

Removal:
- Disconnect the MAF sensor's electrical connector.
- Unscrew the MAF sensor from its housing.
Cleaning (if reusing):
- Use MAF sensor cleaner. Do not use other cleaners as they can damage the sensor.
- Allow the sensor to dry completely before reinstalling.
Replacement (if necessary):
- Install the new MAF sensor in reverse order of removal, ensuring a secure fit.

4. Fuel System Inspection

Fuel Pressure Test:
- Attach a fuel pressure gauge to the Schrader valve on the fuel rail.
- Turn the ignition to the "On" position (do not start the engine) and record the pressure. Compare it to the specifications for the vehicle.
Replace Fuel Filter:
- If pressure is low, inspect and replace the fuel filter if it is clogged.

5. Throttle Body Cleaning

Accessing the Throttle Body:
- Remove the air intake duct to expose the throttle body.
Cleaning:
- Use throttle body cleaner and a soft cloth to remove carbon buildup around the throttle plate and inside the throttle body.
- Ensure not to damage the throttle position sensor.

6. Exhaust Leak Repair

Inspection:
- Visually inspect the exhaust manifold, gaskets, and pipes for signs of leaks.
Repair:
- Replace any damaged gaskets or components as needed.