how to resolve P0171 code in Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather tools and necessary parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and intake manifold gaskets for cracks or wear.
  2. Use a smoke machine or propane torch to identify leaks; listen for hissing sounds.
  3. Replace any damaged hoses or gaskets with OEM parts.
• Tools Required: Vacuum gauge, smoke machine, or propane torch.

3. Clean the MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Spray MAF sensor cleaner onto the sensor element without touching it.
  4. Allow it to dry completely before reinstalling.
• Tools Required: MAF sensor cleaner.

4. Check Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (do not start) and note the pressure reading.
  3. Compare the reading to the manufacturer's specifications (usually between 40-50 psi).
  4. If pressure is low, inspect the fuel pump and filter for issues.
• Tools Required: Fuel pressure gauge.

5. Inspect Throttle Body

• Sub-steps:
  1. Remove the air intake duct to access the throttle body.
  2. Inspect the throttle body for carbon buildup or obstructions.
  3. Clean the throttle body using throttle body cleaner and a soft cloth.
  4. Reassemble the intake duct securely.
• Tools Required: Throttle body cleaner.