how to fix P0171 code in Honda Accord 10th Generation (2018-2022)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery cable to ensure safety.

Tools Required:

• OBD-II scanner
• Fuel pressure gauge
• Socket set
• Torque wrench
• Cleaning supplies (MAF cleaner, rags)

2. Inspect and Replace Air Intake Components

• Inspect Hoses:

  • Visually check all air intake hoses for cracks or loose connections.
  • Tighten any loose connections and replace damaged hoses.

• Clean MAF Sensor:

  • Remove the MAF sensor from the air intake.
  • Spray MAF cleaner onto the sensor element and allow it to dry.
  • Reinstall the MAF sensor.

3. Check and Replace Fuel System Components

• Fuel Pressure Check:

  • Connect the fuel pressure gauge to the fuel rail.
  • Turn the ignition key to the ON position (without starting the engine) to check pressure.
  • If pressure is below specifications (refer to service manual), replace the fuel pump.

• Inspect Fuel Injectors:

  • Remove the fuel rail to access injectors.
  • Check for clogs and leaks; clean or replace injectors as necessary.
  • Reinstall the fuel rail and connect all lines securely.

4. Repair Vacuum Leaks

• Inspect and Repair:
  • Use a smoke machine or spray soapy water around intake manifold and vacuum hoses to find leaks.
  • Replace any damaged gaskets or hoses found during inspection.

5. Reassemble and Test

• Reconnect all components removed during the repair.
• Reconnect the negative battery cable.
• Start the engine and allow it to reach operating temperature.