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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal.
• Ensure the vehicle is on a flat surface and secured with wheel chocks.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually check all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine to detect leaks around the intake manifold and throttle body.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the MAF sensor with MAF cleaner; allow it to dry completely.
  4. If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check and Repair Fuel System

• Sub-steps:
  1. Use a fuel pressure gauge to check that fuel pressure is within specifications (usually between 30-40 psi).
  2. Inspect fuel injectors for clogs using a fuel injector cleaner or ultrasonic cleaning method.
  3. Replace any faulty injectors as necessary.

5. Inspect Engine Coolant Temperature Sensor

• Sub-steps:
  1. Locate the coolant temperature sensor.
  2. Disconnect the sensor and test it with a multimeter to ensure it reads within the manufacturer’s specified range.
  3. If faulty, replace the engine coolant temperature sensor.