how to deal with P0171 code on Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather tools and parts. Ensure the vehicle is parked on a level surface and the engine is cool.
• Tools Required: OBD-II scanner, socket set, torque wrench, fuel pressure gauge, cleaning supplies for MAF sensor.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Disconnect the negative terminal of the battery.
  • Visually inspect all intake hoses, clamps, and the throttle body for signs of wear or damage.
  • Use a smoke machine or soapy water to check for leaks in the intake system. Repair or replace any damaged components.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor from the duct.
  • Use MAF sensor cleaner to spray and gently clean the sensor element. Allow it to dry completely.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel System Pressure

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail test port.
  • Turn the ignition to the "ON" position (do not start the engine) and check the pressure reading against manufacturer specifications.
  • If the pressure is low, check the fuel pump, filter, and lines for blockages or failure and replace if necessary.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  • Remove the fuel rail from the engine (ensure to relieve fuel pressure first).
  • Inspect each injector for clogs or leaks. Clean with an appropriate injector cleaner or replace if needed.
  • Reinstall the fuel rail and ensure all connections are secure.

6. Inspect Engine Vacuum Lines

• Sub-steps:
  • Visually inspect all vacuum lines connected to the engine for cracks or disconnections.
  • Replace any damaged lines and ensure that all connections are tight.