how to fix a P0171 code on Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the intake hoses for cracks or damage.
  2. Tighten or replace any loose or damaged hoses.
  3. Use a smoke machine to detect any vacuum leaks in the intake system.

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.
  3. Use MAF sensor cleaner to clean the sensor elements carefully.
  4. Reinstall the MAF 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 to the ON position (do not start) and check the fuel pressure.
  3. If the pressure is below specifications, check the fuel pump and filter for issues.
  4. Replace the fuel filter if clogged, and consider replacing the fuel pump if it fails to deliver adequate pressure.

5. Inspect and Replace PCV Valve

• Sub-steps:
  1. Locate the PCV valve and hoses.
  2. Remove the PCV valve and inspect it for blockage or failure.
  3. Replace the PCV valve if it is not functioning properly.
  4. Reconnect the hoses securely.