how to fix P0171 lean code in Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery cable to prevent electrical shorts.

2. Inspect and Repair Intake System

• Tools Required: Socket set, vacuum gauge, inspection mirror.
• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a vacuum gauge to check for leaks in the intake manifold.
  3. If any leaks are found, replace the damaged hoses or gaskets.
  4. Reconnect any loose connections securely.

3. Check and Clean MAF Sensor

• Tools Required: MAF cleaner, Torx screwdriver.
• Sub-steps:
  1. Locate the MAF sensor in the intake tract.
  2. Remove the MAF sensor by unscrewing the retaining screws.
  3. Use MAF cleaner to gently clean the sensor element; avoid touching the sensing wires.
  4. Allow the sensor to dry completely before reinstalling it.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Sub-steps:
  1. Locate the fuel rail and the Schrader valve.
  2. Connect the fuel pressure gauge to the Schrader valve.
  3. Turn the ignition to the "ON" position (do not start) to prime the fuel system.
  4. Check the fuel pressure reading against the manufacturer's specifications (typically 30-50 psi).
  5. If the pressure is low, inspect the fuel pump and filter for issues.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaner kit, socket set.
• Sub-steps:
  1. Remove the fuel rail with injectors attached from the engine.
  2. Apply fuel injector cleaner through the injector ports using the cleaning kit.
  3. Reinstall the injectors and fuel rail securely.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery cable.
• Use the OBD-II scanner to clear the P0171 code from the vehicle's computer.