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

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the intake ducting for any cracks or loose connections.
  2. Tighten any loose clamps and replace any damaged hoses.
  3. If necessary, replace the air filter if it is clogged.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector carefully.
  3. Remove the MAF sensor from its housing.
  4. Clean the sensor with MAF cleaner, ensuring not to touch the sensor with fingers.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition to the "On" position without starting the engine and check the fuel pressure.
  3. Compare the reading with the manufacturer's specifications (typically 40-50 psi).
  4. If the pressure is low, check the fuel pump and filter for issues, replacing them if necessary.

5. Inspect Vacuum Hoses

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold.
  2. Look for any cracks, leaks, or disconnections.
  3. Replace any damaged hoses with new ones.

6. Verify Throttle Body Operation

• Sub-steps:
  1. Remove the throttle body from the intake manifold.
  2. Clean the throttle body using throttle body cleaner.
  3. Reinstall the throttle body ensuring all gaskets are intact.