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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface, the engine is cool, and the battery is disconnected.
• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, multimeter, cleaning supplies (throttle body cleaner, MAF cleaner).

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a smoke machine or spray carburetor cleaner around the intake area while the engine is running to identify leaks.
  3. Replace any damaged hoses or gaskets found during the inspection.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the MAF sensor using a socket set.
  3. Clean the sensor with MAF cleaner and allow it to dry completely.
  4. If the sensor is damaged, replace it with a new one and reconnect.

4. Check Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (do not start the engine) and check the pressure reading.
  3. If the pressure is below specifications, inspect the fuel pump and fuel filter for blockage or failure.
  4. Replace the fuel pump or filter as necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail and inspect the injectors for clogs or leaks.
  2. Clean the injectors with a fuel injector cleaning kit or replace if they are beyond cleaning.
  3. Reinstall the fuel rail and ensure all connections are secure.