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

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, and replacement vacuum hoses.
• Steps:
  1. Use a vacuum gauge to test for leaks by attaching it to a vacuum source.
  2. Inspect all vacuum hoses for cracks or wear; replace any damaged hoses.
  3. Ensure all hose clamps are tight and connections are secure.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaning spray (if cleaning), or a new MAF sensor if replacing.
• Steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. If cleaning, spray the MAF cleaning solution onto the sensor; let it dry completely.
  4. If replacing, install the new sensor and reconnect the electrical connector.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure reading.
  3. If the pressure is below specifications, investigate the fuel pump and filter for replacement.

5. Replace Engine Coolant Temperature Sensor (if faulty)

• Tools Required: Socket set, new coolant temperature sensor.
• Steps:
  1. Locate the engine coolant temperature sensor on the engine block.
  2. Disconnect the electrical connector and remove the sensor using the socket set.
  3. Install the new sensor and reconnect the electrical connector.