how to fix P0171 code in Ford F-150 14th Generation (2021-2024)

Learn how to diagnose and fix P0171 fuel system issue in Ford F-150 (2021-2024). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety while working on electrical components.

2. Inspect and Repair the Air Intake System

• Tools Required: Socket set, screwdrivers, flashlight
• Visually inspect all air intake hoses for cracks or disconnections.
• Tighten or replace any loose or damaged hoses and clamps.

3. Check and Clean the MAF Sensor

• Tools Required: MAF sensor cleaner or electrical contact cleaner
• Remove the MAF sensor from the air intake ducting.
• Spray the MAF sensor with the cleaner, avoiding touching the sensor elements.
• Allow the sensor to dry completely before reinstalling it.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition to the "ON" position without starting the engine.
• Check pressure readings against manufacturer specifications; typically, it should be between 30-60 psi.
• If pressure is low, inspect the fuel pump and filter for issues.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket
• Locate the upstream oxygen sensor (typically before the catalytic converter).
• Remove the sensor and inspect for carbon buildup or damage.
• Replace the sensor if necessary.

6. Verify Fuel Injector Operation

• Tools Required: Fuel injector tester or multimeter
• Check each fuel injector for resistance and proper operation.
• Clean or replace any defective injectors.