how to fix P0171 code on my Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts during repairs.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Inspect for Vacuum Leaks:
  • Visually inspect hoses and connections in the air intake system.
  • Use a smoke machine or carburetor cleaner to identify leaks.
• Repair or Replace Leaky Components:
  • Replace cracked hoses or damaged gaskets.
  • Ensure the intake manifold is properly sealed.

3. Clean or Replace MAF Sensor

• Remove the MAF Sensor:
  • Disconnect the electrical connector.
  • Unscrew the MAF sensor from the air intake.
• Clean the MAF Sensor:
  • Use MAF sensor cleaner to spray the sensor element carefully.
  • Allow it to dry completely before reinstallation.
• Reinstall the MAF Sensor:
  • Secure the sensor back in place and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Attach Fuel Pressure Gauge:
  • Locate the fuel rail and attach the gauge to the Schrader valve.
• Check Pressure Reading:
  • Compare the reading with manufacturer specifications (usually around 40-50 psi).
• Replace Fuel Pump or Filter if Necessary:
  • If pressure is low, consider replacing the fuel filter or fuel pump.

5. Inspect and Clean Fuel Injectors

• Perform a Fuel Injector Balance Test:
  • Use an injector pulse tester to verify all injectors are functioning.
• Clean or Replace Fuel Injectors:
  • If injectors are clogged, use a fuel injector cleaner or replace them.