how to fix P0171 code in Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent electrical shocks.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, vacuum gauge, hose clamps.
• Sub-steps:
  1. Visually inspect the air intake hoses and connections for signs of wear or damage.
  2. Tighten any loose clamps and replace any damaged hoses.
  3. If necessary, replace the air filter to ensure proper airflow.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver set.
• Sub-steps:
  1. Locate the MAF sensor on the air intake duct.
  2. Disconnect the electrical connector and carefully remove the sensor.
  3. Spray MAF sensor cleaner on the sensor element, avoiding direct contact with the component.
  4. Allow the sensor to dry completely before reinstalling.
  5. Reconnect the electrical connector and secure the sensor back in place.

4. Test and Repair Fuel System

• Tools Required: Fuel pressure gauge, socket set.
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine and check the fuel pressure.
  3. Compare the reading to manufacturer specifications (typically around 40-50 psi).
  4. If the pressure is low, inspect the fuel pump and filter for issues; replace as necessary.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner, socket set.
• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Disconnect the electrical connectors and fuel lines from the injectors.
  3. Use fuel injector cleaner to clean each injector or replace faulty injectors as needed.
  4. Reinstall the fuel rail and reconnect all components.