how to fix P0171 code on Honda Pilot YF4 (2023-Present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery cable to prevent electrical shock.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers
• Check all intake hoses for cracks or damage.
• Tighten any loose clamps on the intake system.
• Replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Remove the MAF sensor from the intake duct.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely.
• Reinstall the MAF sensor securely.

4. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition key to the "ON" position without starting the engine and check the fuel pressure.
• If the pressure is below specifications, inspect the fuel pump and replace the fuel filter if clogged.

5. Inspect and Test Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter
• Remove the oxygen sensor from the exhaust system.
• Test the sensor's resistance and voltage output according to the manufacturer's specifications.
• Replace the sensor if it does not meet specifications.

6. Test and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit
• Remove the fuel injectors from the engine.
• Use a fuel injector cleaning kit to clean each injector thoroughly.
• Reinstall the injectors and ensure proper connections.