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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all air intake hoses for cracks or disconnections.
  • Use a smoke machine to detect any vacuum leaks in the intake system.
  • Replace any damaged hoses or gaskets found during inspection.

3. Check and Clean MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the intake duct.
  • Disconnect the electrical connector from the MAF sensor.
  • Remove the sensor using a Torx or socket wrench.
  • Clean the MAF sensor with MAF cleaner spray; do not touch the sensor element.
  • Reinstall the sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Sub-steps:
  • Locate the fuel rail pressure test port.
  • Attach a fuel pressure gauge to the test port.
  • Turn the ignition to the "ON" position without starting the engine and check the pressure reading against the manufacturer's specifications (typically 30-50 PSI).
  • If pressure is low, check the fuel pump and fuel filter.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the fuel rail to access the fuel injectors.
  • Inspect injectors for clogs; clean them using a fuel injector cleaning kit if necessary.
  • Replace any faulty injectors.