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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Inspect the air intake duct and hoses for cracks or loose connections.
• Tighten or replace any damaged hoses or clamps.
• Use a vacuum gauge to check for leaks in the intake manifold.

3. Clean or Replace MAF Sensor

• Tools Required: Torx screwdriver, MAF cleaner
• Locate the MAF sensor in the air intake path.
• Disconnect the electrical connector and remove the MAF sensor.
• Clean the sensor with MAF cleaner and allow it to dry.
• If damaged, replace the MAF sensor with a new one.

4. Inspect and Test Fuel System

• Tools Required: Fuel pressure gauge, multimeter
• Connect the fuel pressure gauge to the fuel rail and turn the ignition on (do not start the engine).
• Check that the fuel pressure is within the manufacturer's specified range.
• If the pressure is low, inspect the fuel filter and replace if necessary.
• Test the fuel pump and fuel injectors using a multimeter to ensure they are functioning correctly.

5. Check Vacuum Lines

• Inspect all vacuum lines for cracks or disconnections.
• Replace any damaged vacuum hoses to ensure a proper seal.

6. Clear Codes and Test Drive

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the P0171 code.
• Start the engine and check for proper idle.
• Test drive the vehicle to confirm the issue is resolved.