how to fix P0171 code in Honda Pilot YF3 (2016-2022)

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool completely before starting work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, flashlight, inspection mirror.
• Inspect all vacuum hoses for cracks or disconnections.
• Use a vacuum gauge to test the intake manifold for leaks.
• Repair or replace any damaged hoses or gaskets found during inspection.

3. Clean the MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Remove the MAF sensor from its housing.
• Spray the MAF sensor with MAF cleaner (do not touch the sensor element).
• Allow the sensor to dry completely before reinstalling.

4. Test and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Attach the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position (without starting the engine) to check pressure.
• If pressure is low, check the fuel pump and filter for issues; replace as necessary.

5. Replace Oxygen Sensor (if necessary)

• Tools Required: O2 sensor socket, wrench.
• Locate the upstream oxygen sensor and disconnect the electrical connector.
• Use the O2 sensor socket to remove the old sensor.
• Install the new sensor and reconnect the electrical connector, ensuring a secure fit.