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

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdriver, vacuum gauge.
• Inspect the air intake duct for cracks or loose fittings:
  1. Remove the air intake duct by loosening the clamps.
  2. Visually inspect for any signs of damage.
  3. Replace any damaged components or reattach loose fittings securely.

3. Clean MAF Sensor

• Tools Required: MAF cleaner spray, soft cloth.
• Remove the MAF sensor:
  1. Disconnect the electrical connector.
  2. Unscrew the MAF sensor from the air intake.
• Clean the sensor:
  1. Spray the MAF cleaner onto the sensor element.
  2. Allow it to dry completely before reinstallation.
• Reinstall the MAF sensor securely.

4. Check and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps.
• Perform a vacuum test:
  1. Connect a vacuum gauge to the intake manifold.
  2. Start the engine and observe the reading; it should be within the manufacturer’s specifications.
• Inspect and replace any damaged vacuum hoses.

5. Fuel Pressure Check

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail:
  1. Start the engine and observe the fuel pressure reading.
  2. Compare the reading to specifications; if low, check the fuel pump and filter.
• Replace the fuel pump if it does not meet required pressure.