what does it mean if my Ford F-150 13th Generation (2015-2020) has a P0171 code

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.

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before performing any work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify any leaks by spraying around suspected areas and observing changes in engine RPM.
  3. Replace any damaged hoses and ensure all connections are secure.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Remove the sensor from its housing by unscrewing or unclipping it.
  3. Clean the sensor carefully using MAF sensor cleaner (do not touch the sensor element).
  4. Reinstall the MAF sensor and ensure it is properly secured.

4. Check Fuel Delivery

• Sub-steps:
  1. Use a fuel pressure gauge to check the fuel pressure at the fuel rail; it should meet the specifications outlined in the repair manual (typically around 30-60 psi for F-150).
  2. If fuel pressure is low, inspect the fuel pump and filter for clogs or malfunctions.
  3. Test each fuel injector for proper operation using a noid light or by measuring resistance.

5. Inspect Exhaust System

• Sub-steps:
  1. Visually check the exhaust system for any signs of leaks, particularly around the manifold and joints.
  2. Repair or replace any damaged exhaust components as necessary.