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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.

Tools Required:

• OBD-II scanner
• Vacuum gauge
• Fuel pressure gauge
• Basic hand tools (sockets, wrenches, etc.)
• Multimeter
• Cleaning supplies (MAF cleaner, rags)

2. Inspect and Repair Vacuum Leaks

• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a vacuum gauge to check for proper readings.
• Replace any damaged hoses or gaskets found during the inspection.

3. Clean the Mass Air Flow Sensor

• Remove the MAF sensor from the air intake duct (usually secured with screws or clamps).
• Spray MAF cleaner onto the sensor elements and allow it to dry completely.
• Reinstall the MAF sensor and ensure it is securely fastened.

4. Check and Adjust Fuel Pressure

• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and observe the pressure reading. It should match manufacturer specifications.
• If the pressure is low, check the fuel pump and filter. Replace if necessary.

5. Inspect and Clean Fuel Injectors

• If the fuel injectors are suspected to be clogged, remove them from the fuel rail.
• Use an injector cleaning kit to clean the injectors or replace them if they are faulty.
• Reinstall the injectors and ensure all connections are tight.

6. Replace Oxygen Sensors (if needed)

• If the oxygen sensors are not functioning correctly, remove the old sensors using an O2 sensor socket.
• Install new oxygen sensors according to manufacturer specifications (torque as per specs).
• Reconnect any wiring and harnesses.