how to diagnose P0171 code in Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to ensure safety while working on the vehicle.
• Allow the engine to cool down before proceeding.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Inspect the air intake duct for cracks or loose connections.
• Tighten any loose clamps or replace damaged hoses.
• If necessary, replace the entire air intake duct.

3. Clean the MAF Sensor

• Tools Required: MAF sensor cleaner, soft cloth
• Remove the MAF sensor from the air intake system.
• Spray the MAF sensor with a dedicated cleaner and let it dry completely.
• Reinstall the MAF sensor securely.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition to the "ON" position without starting the engine.
• Compare the reading to the manufacturer’s specifications; if low, check the fuel pump and filter.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaner, multimeter
• Remove fuel injectors from the engine.
• Clean the injectors using an appropriate injector cleaning solution.
• Test each injector’s resistance with a multimeter; replace any that are out of specification.

6. Examine Vacuum Hoses

• Tools Required: Visual inspection
• Check all vacuum hoses connected to the intake manifold for leaks or cracks.
• Replace any damaged hoses to ensure a proper seal.