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

Solution

1. Preparation

• Gather tools: OBD-II scanner, multimeter, fuel pressure gauge, vacuum gauge, socket set.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or disconnections.
  2. Tighten any loose clamps or replace damaged hoses as needed.
  3. Remove the air filter and inspect it for dirt or clogs; replace if necessary.

3. MAF Sensor Cleaning

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Use MAF sensor cleaner to spray the sensing elements; do not touch them.
  4. Allow the sensor to dry completely before reinstalling.

4. Fuel System Check

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position (do not start) and read the pressure; it should be within the manufacturer's specifications.
  3. If the pressure is low, inspect or replace the fuel pump and filter as necessary.

5. Vacuum Leak Inspection

• Sub-steps:
  1. Use a vacuum gauge to check for proper manifold vacuum.
  2. Spray a small amount of carburetor cleaner around the intake manifold and vacuum hoses while the engine is running; if the RPM increases, there is a vacuum leak.
  3. Repair or replace any leaking components.