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

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum pump, hose clamps
• Inspect all vacuum hoses and connections from the intake manifold to the throttle body.
• Use a vacuum pump to check for leaks.
• Repair or replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, Torx screwdriver
• Remove the MAF sensor from the air intake duct.
• Spray MAF sensor cleaner on the sensing element and allow it to dry.
• Reinstall the MAF sensor securely.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition key to the "ON" position (without starting) and observe the pressure.
• If the pressure is below the manufacturer's specifications, check and replace the fuel pump or filter as needed.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaner kit, socket set
• Remove the fuel injectors from the fuel rail.
• Use an injector cleaner kit to clean each injector.
• Reinstall the injectors ensuring proper seating and torque specifications are followed.

6. Replace Oxygen Sensor (if necessary)

• Tools Required: O2 sensor socket, torque wrench
• Locate the upstream oxygen sensor on the exhaust manifold.
• Disconnect the sensor connector and remove the sensor using an O2 sensor socket.
• Install the new sensor and torque it to the manufacturer's specifications.
• Reconnect the sensor connector.