how to fix P0171 code in 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 symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on the vehicle.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold.
  2. Replace any cracked or damaged hoses.
  3. Use a smoke machine to detect hidden leaks if necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner or a soft cloth
• Sub-steps:
  1. Locate the MAF sensor in the intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the sensor element with MAF cleaner and allow it to dry.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) and check the fuel pressure. It should match manufacturer specifications.
  3. If pressure is low, check the fuel pump and replace the fuel filter if necessary.

5. Inspect Intake Manifold Gasket

• Sub-steps:
  1. Remove any components obstructing access to the intake manifold.
  2. Inspect the gasket for signs of wear or damage.
  3. If damaged, replace the gasket with a new one.

6. Test Oxygen Sensor

• Tools Required: Multimeter
• Sub-steps:
  1. Disconnect the oxygen sensor connector.
  2. Use a multimeter to test the voltage output according to the service manual specifications.
  3. Replace the sensor if it does not meet the specified voltage range.