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

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the negative terminal of the battery to avoid any electrical shorts during repairs.

2. Inspect Air Intake System

• Tools Required: Screwdriver set, flashlight
• Remove the air intake duct.
• Inspect for cracks, loose connections, or blockages.
• Replace any damaged components or secure loose connections.

3. Clean or Replace MAF Sensor

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

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure reading.
• It should match the manufacturer specifications (typically around 40-50 psi).
• If pressure is low, check the fuel pump and fuel filter for issues.

5. Inspect and Clean Fuel Injectors

• If fuel pressure is adequate, remove the fuel injectors.
• Tools Required: Injector puller, cleaning solution
• Clean the injectors using a professional injector cleaning kit or replace them if they are too clogged or damaged.
• Reinstall the injectors and ensure proper sealing.

6. Inspect Vacuum Lines

• Visually inspect all vacuum hoses connected to the intake manifold.
• Look for signs of wear, cracks, or disconnections.
• Replace any damaged hoses to ensure no air leaks.