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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical issues.
• Allow the engine to cool down before commencing work.

2. Inspect and Repair Air Intake System

• Sub-steps:

  1. Visually inspect all vacuum hoses and the intake manifold for cracks or leaks.
  2. Use a smoke machine to find any hidden vacuum leaks.
  3. Replace any damaged hoses or gaskets identified during inspection.

• Tools Required:

  • Smoke machine
  • Screwdrivers
  • Replacement hoses/gaskets

3. Check Fuel Pressure

• Sub-steps:

  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure.
  3. Compare the reading to the specifications (typically around 40-50 psi for Honda Pilot).
  4. If pressure is low, inspect the fuel pump and filter.

• Tools Required:

  • Fuel pressure gauge

4. Clean or Replace MAF Sensor

• Sub-steps:

  1. Disconnect the MAF sensor electrical connector.
  2. Remove the sensor from the air intake duct.
  3. Clean the sensor with MAF cleaner or replace it if damaged.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

• Tools Required:

  • MAF cleaner
  • Screwdriver set

5. Inspect and Test Oxygen Sensors

• Sub-steps:

  1. Locate the upstream and downstream oxygen sensors.
  2. Check for wiring damage or loose connections.
  3. Use a multimeter to test the sensor's voltage output while the engine is running.
  4. Replace any faulty oxygen sensors.

• Tools Required:

  • Multimeter

6. Fuel Injector Cleaning or Replacement

• Sub-steps:

  1. Remove the fuel rail to access the fuel injectors.
  2. Clean the injectors using a professional injector cleaning kit or replace them if necessary.
  3. Reinstall the fuel rail and ensure all connections are secure.

• Tools Required:

  • Fuel injector cleaning kit
  • Ratchet and socket set