Genesis G70 IG (2017-2023) how to fix P0171 lean code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.
• Raise the vehicle if necessary and secure it on jack stands.

2. Inspect and Repair Air Intake System

• Inspect Hoses and Connections:
  • Check all air intake hoses for cracks or loose fittings.
  • Tighten or replace any loose or damaged hoses.
• Inspect the Intake Manifold:
  • Remove any components obstructing access to the intake manifold.
  • Inspect the intake manifold gasket for leaks and replace if necessary.

3. Clean or Replace MAF Sensor

• Remove MAF Sensor:
  • Disconnect the MAF sensor electrical connector.
  • Remove the sensor from the air intake duct.
• Clean the Sensor:
  • Use MAF sensor cleaner to gently clean the sensor element.
  • Allow the sensor to dry completely before reinstalling.
• Reinstall the MAF Sensor:
  • Reattach the MAF sensor and its electrical connector securely.

4. Test and Inspect Fuel System

• Check Fuel Pressure:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the ON position (do not start the engine) and check the pressure.
  • Compare the reading with manufacturer specifications.
• Inspect Fuel Injectors:
  • Remove fuel injectors and inspect for clogs or leaks.
  • Clean or replace injectors if they are faulty.

5. Vacuum System Inspection

• Check for Vacuum Leaks:
  • Use a smoke machine to introduce smoke into the vacuum lines and listen for any escaping smoke.
  • Repair or replace any vacuum hoses that are found to be leaking.