how to fix P0171 code on Honda Pilot YF4 (2023-Present)?

Solution

1. Preparation

• Ensure the vehicle is parked on a flat surface and the ignition is off.
• Disconnect the negative battery terminal to prevent electrical issues.

2. Inspect and Repair Air Intake System

• Sub-steps:

  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. If leaks are found, replace the damaged hoses.
  3. Inspect the intake manifold gasket for proper sealing; replace if necessary.

• Tools Required:

  • Socket set
  • Screwdrivers

3. Check and Clean MAF Sensor

• Sub-steps:

  1. Remove the MAF sensor from the intake duct by unscrewing the mounting screws.
  2. Use MAF sensor cleaner to spray the sensing element; do not touch it with any tools.
  3. Allow it to dry completely before reinstalling.

• Tools Required:

  • Torx or socket wrench
  • MAF sensor cleaner spray

4. Test Fuel Pressure

• Sub-steps:

  1. Connect a fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition to the ON position (do not start the engine) to prime the fuel system and check the reading.
  3. Compare the pressure reading with the manufacturer specifications; replace the fuel pump if pressure is low.

• Tools Required:

  • Fuel pressure gauge

5. Inspect Fuel Injectors

• Sub-steps:

  1. Remove the engine cover (if applicable) to access the fuel injectors.
  2. Inspect the electrical connectors for corrosion or damage.
  3. Use an injector cleaner to clean clogged injectors or replace them if they are faulty.

• Tools Required:

  • Injector cleaning kit
  • Socket set