how to fix the P0171 code on my Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather required tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery cable for safety.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the air intake duct to access the throttle body and MAF sensor.
  2. Inspect the duct for cracks or loose fittings; replace as necessary.
  3. Clean the MAF sensor using MAF cleaner spray (do not touch the sensor element).

3. Check Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition key to the ON position (do not start) to build pressure.
  3. Verify that the fuel pressure reads within the manufacturer's specifications (typically 40-50 psi).
  4. If pressure is low, inspect the fuel pump, fuel filter, and fuel lines for issues.

4. Inspect Vacuum Hoses

• Sub-steps:
  1. Trace all vacuum hoses connected to the intake manifold.
  2. Look for any signs of wear, cracks, or disconnections.
  3. Replace any damaged hoses with new ones and ensure all connections are tight.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  1. With the engine running, use a stethoscope or a mechanic's tool to listen to each fuel injector for a clicking sound.
  2. If an injector is not functioning, remove and test it using a bench tester.
  3. Replace any faulty injectors with OEM components.