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

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.

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the air intake duct by loosening the clamps and disconnecting any electrical connectors.
  2. Visually inspect the duct for cracks or holes; replace if damaged.
  3. Check all vacuum hoses connected to the intake for leaks; replace any faulty hoses.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor, usually positioned between the air filter and throttle body.
  2. Disconnect the electrical connector and remove the sensor using a Torx or socket wrench.
  3. Clean the sensor element with MAF sensor cleaner (do not use any other cleaner).
  4. Allow the sensor to dry completely before reinstalling or replace it if damaged.

4. Test and Repair Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition on (without starting) and check the fuel pressure; it should meet the manufacturer specifications (typically around 50-60 psi).
  3. Replace the fuel filter if the pressure is low or if it has not been replaced in a while.
  4. If pressure is low, inspect the fuel pump and relay for proper operation.

5. Clear Codes and Reconnect Battery

• Sub-steps:
  1. Reconnect the battery terminals.
  2. Use the OBD-II scanner to clear the P0171 code from the PCM.