my Genesis G70 IG (2017-2023) has a check engine light and P0171 code

Solution

1. Preparation

• Gather necessary tools and parts. Ensure the vehicle is parked on a flat surface and the engine is cool.
• Tools Required: OBD-II scanner, socket set, screwdriver set, multimeter, vacuum gauge.

2. Inspect Air Intake System

• Sub-steps:
  1. Visually inspect all hoses and connections in the air intake path for cracks or disconnections.
  2. Use a vacuum gauge to check for vacuum leaks.
  3. If any leaks are found, replace the affected hoses or components.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake duct using the appropriate socket.
  3. Clean the MAF sensor with MAF cleaner spray; do not touch the sensor element with fingers or tools.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition key to the ON position (do not start the engine) to check the fuel pressure against manufacturer specifications.
  3. If the pressure is low, inspect or replace the fuel pump and fuel filter as necessary.

5. Inspect Throttle Body

• Sub-steps:
  1. Remove the air intake duct to access the throttle body.
  2. Use a throttle body cleaner to remove carbon buildup.
  3. Inspect the throttle body plate for smooth operation and reassemble.

6. Replace Oxygen Sensors (if needed)

• Sub-steps:
  1. Use a socket to remove the upstream oxygen sensor from the exhaust manifold.
  2. Install the new oxygen sensor and tighten to manufacturer specifications.
  3. Reconnect the electrical connector.