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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.

Tools Required:

• OBD-II scanner
• Fuel pressure gauge
• Socket set
• Torque wrench
• MAF sensor cleaner
• Screwdrivers

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the engine cover if present.
  2. Inspect all intake hoses for cracks or disconnections. Replace any damaged hoses.
  3. Check the intake manifold for leaks. Use a smoke machine if necessary to identify any leaks.

Parts Required:

• Intake hoses (if damaged)
• Intake manifold gasket (if leaking)

3. Test and Clean MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor connector.
  2. Remove the MAF sensor from the intake.
  3. Spray MAF sensor cleaner onto the sensor elements. Allow it to dry completely before reinstalling.
  4. Reinstall the sensor and reconnect the connector.

4. Check Fuel System

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start) to check the fuel pressure; it should be within specifications (consult the service manual for correct values).
  3. If the pressure is low, inspect the fuel pump and fuel filter for issues.

Parts Required:

• Fuel filter (if necessary)
• Fuel pump (if found faulty)

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  1. If fuel injectors are suspected to be blocked, remove them from the engine.
  2. Use an injector cleaning kit or have them professionally cleaned.
  3. Reinstall the injectors with new O-rings.