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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually check all hoses connected to the intake manifold for cracks or disconnections.
  2. Use carburetor cleaner or a smoke machine to detect leaks at the intake manifold and vacuum hoses.
  3. Replace any damaged hoses or gaskets.
• Tools Required: Smoke machine or carburetor cleaner, pliers.

3. Check and Replace Fuel Filter

• Sub-steps:
  1. Locate the fuel filter (usually near the fuel tank).
  2. Relieve fuel system pressure before disconnecting the filter by removing the fuel pump fuse and starting the engine until it stalls.
  3. Disconnect the fuel lines from the filter using a line wrench.
  4. Replace the old fuel filter with a new one.
  5. Reconnect the fuel lines and ensure they are secure.
• Tools Required: Line wrench, safety goggles, rags.

4. Inspect and Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector from the sensor.
  3. Remove the sensor by loosening the clamps.
  4. Clean the sensor with MAF cleaner spray, avoiding contact with the sensor elements.
  5. Reinstall the sensor and reconnect the electrical connector.
• Tools Required: MAF cleaner spray, screwdriver.

5. Test Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the Schrader valve on the fuel rail.
  2. Turn the ignition to the "ON" position (do not start) and check if the pressure rises to the manufacturer's specifications.
  3. If the pressure is low, inspect the fuel pump and relay for functionality.
• Tools Required: Fuel pressure gauge.