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

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 necessary tools and parts.
• Park the vehicle on a level surface and ensure the engine is cool.
• Disconnect the battery negative terminal.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Instructions:
  1. Remove the air intake duct and air filter.
  2. Inspect hoses for cracks or leaks; replace any damaged hoses.
  3. Reinstall the air intake duct and air filter securely.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Instructions:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake.
  3. Clean the sensor using MAF sensor cleaner; avoid touching the sensor element.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect Fuel System

• Tools Required: Fuel pressure gauge
• Instructions:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure.
  3. Compare the reading with manufacturer specifications; replace the fuel pump if pressure is low.
  4. Check fuel injectors for clogs or leaks; clean or replace as necessary.

5. Check Vacuum Lines

• Tools Required: Smoke machine (optional for leak detection)
• Instructions:
  1. Visually inspect all vacuum lines for damage or disconnection.
  2. If available, use a smoke machine to detect leaks in the vacuum system.
  3. Replace any damaged or leaking vacuum hoses.

6. Verify Oxygen Sensor Operation

• Tools Required: OBD-II scanner
• Instructions:
  1. Use an OBD-II scanner to monitor the oxygen sensor readings while the engine is running.
  2. If the readings are erratic or out of range, replace the oxygen sensor.