how to fix Honda Pilot YF4 (2023-Present) check engine light P0171?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect Air Intake System

• Tools Required: Screwdriver set, flashlight
• Remove the air intake duct and visually inspect for cracks or loose connections.
• Tighten any loose clamps and replace damaged hoses.

3. Clean or Replace MAF Sensor

• Tools Required: Torx or Phillips screwdriver, MAF sensor cleaner
• Disconnect the electrical connector from the MAF sensor.
• Remove the sensor from the intake manifold using the appropriate screwdriver.
• Clean the sensor with MAF cleaner following the manufacturer's guidelines. If damaged, replace with a new sensor.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel pressure test port on the fuel rail.
• Attach the fuel pressure gauge and turn the ignition to the "ON" position without starting the engine to check the pressure reading.
• If the pressure is below specifications, inspect the fuel pump and fuel filter for issues.

5. Inspect and Test Fuel Injectors

• Tools Required: Fuel injector cleaner, multimeter (for electrical testing)
• Remove the fuel injectors from the fuel rail.
• Test the electrical connections with a multimeter to ensure proper voltage.
• Clean the injectors using a fuel injector cleaning kit or replace them if they are clogged or malfunctioning.

6. Reassemble Components

• Reinstall the cleaned or replaced components in reverse order of removal.
• Reconnect the battery.