how to fix P0171 code in Honda Civic 11th Generation (2022-Present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to ensure safety.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses connected to the intake manifold.
  • Use a smoke machine or carburetor cleaner to check for leaks.
  • Replace any damaged or cracked hoses.

3. Check and Replace the MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the intake duct.
  • Disconnect the electrical connector and remove the sensor using a Torx screwdriver.
  • Clean the MAF sensor with MAF cleaner and inspect for damage; replace if necessary.
  • Reinstall the sensor and reconnect the electrical connector.

4. Test and Replace Fuel Pump or Fuel Filter

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position (without starting the engine) to check the pressure.
  • If the pressure is below specifications (check the manual for exact values), replace the fuel filter or fuel pump as needed.
  • Reassemble the fuel system and ensure there are no leaks.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  • If fuel injectors are suspected, remove them from the fuel rail.
  • Clean the injectors using a professional injector cleaning kit or replace them if they are clogged.
  • Reinstall the injectors and ensure the seals are intact.