how to fix P0171 code in Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery to ensure safety.
• Allow the engine to cool completely before working.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold.
  • Replace any cracked or damaged hoses.
  • Check the intake manifold gasket for leaks and replace if necessary.
  • Tighten all clamps and connections to the intake system.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Use MAF sensor cleaner to spray the sensor elements; do not touch them.
  • Allow the sensor to dry completely before reinstalling.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail's Schrader valve.
  • Turn the ignition key to the "ON" position (do not start) to read the pressure.
  • Compare the reading with manufacturer specifications (typically around 40-50 PSI).
  • If the pressure is low, check the fuel pump and filter for blockages and replace as necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the fuel rail to access the fuel injectors.
  • Inspect each injector for signs of clogging or leaks.
  • Use an injector cleaning kit or replace faulty injectors if needed.
  • Reinstall the fuel rail ensuring proper sealing.