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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the vehicle is on a flat surface and secure it with wheel chocks.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine to detect leaks in the intake system.
  3. Replace any damaged hoses or components.

Tools Required:

• Smoke machine
• Basic hand tools (screwdrivers, pliers, etc.)

3. Check and Clean the MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Remove the electrical connector and the sensor using a Torx or socket wrench.
  3. Clean the MAF sensor with MAF cleaner spray and let it dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

Tools Required:

• Torx or socket wrench
• MAF sensor cleaner

4. Test Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition key to the "On" position (without starting the engine) to check the pressure.
  3. Ensure the fuel pressure matches the specifications in the service manual.
  4. If pressure is low, inspect the fuel pump and filter for issues.

Tools Required:

• Fuel pressure gauge

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the engine cover to access the fuel injectors.
  2. Check for any fuel leaks around the injectors.
  3. Use a multimeter to test the resistance of the injectors; replace any that are out of spec.
  4. If necessary, clean or replace the fuel injectors.

Tools Required:

• Multimeter
• Injector cleaner (if needed)