how to fix the P0171 code in my Honda Pilot Third Generation (2016-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down completely.

2. Inspect and Replace Air Intake Components

• Inspect Hoses: Visually check all air intake hoses for cracks, disconnections, or wear. Replace any damaged hoses.
• Clean MAF Sensor: Use MAF sensor cleaner to gently clean the sensor. Allow it to dry before reinstalling.
• Check Air Filter: Remove and inspect the air filter. Replace it if it is dirty or clogged.

3. Fuel System Inspection

• Check Fuel Pressure: Connect a fuel pressure gauge to the fuel rail. Turn the ignition to the "On" position without starting the engine and record the pressure. It should be within manufacturer specifications (typically between 30-50 psi).
• Inspect Fuel Injectors: Remove the fuel rail and visually inspect the injectors for clogs. Clean or replace as necessary.

4. Oxygen Sensor Inspection

• Test the Sensor: Use a multimeter to test the oxygen sensor's voltage output. It should fluctuate between 0.1 to 0.9 volts when the engine is running.
• Replace if Necessary: If the sensor is not functioning properly, replace it with a new unit.

5. Reassemble and Test

• Reinstall all components in reverse order of removal.
• Reconnect the negative battery terminal.
• Start the engine and let it idle for a few minutes.