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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine or propane torch (without ignition) to identify leaks in the intake system.
  3. Replace any damaged hoses or gaskets as necessary.

3. Check and Clean the MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor, typically found in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor from the duct.
  3. Clean the MAF sensor with MAF cleaner spray and a soft brush. Avoid touching the sensor wire.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Test and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (without starting the engine) to check for the initial fuel pressure.
  3. Start the engine and observe the pressure. It should meet the manufacturer’s specifications (typically around 30-40 psi).
  4. If the pressure is low, check the fuel pump and filter for issues, replacing them if necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Locate the fuel injectors and remove the fuel rail assembly if needed.
  2. Use a multimeter to check the resistance of each injector; it should be within the manufacturer’s specifications.
  3. Consider using a fuel injector cleaner if clogs are suspected.
  4. Reassemble the fuel rail and ensure all connections are secure before running the engine.