my Genesis G70 IG (2017-2023) has a check engine light with P0171 code, what's wrong?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before working on any components.

2. Inspect Air Intake System

• Use a flashlight to visually inspect the air intake hoses and connections for any signs of cracks or disconnections.
• Tighten any loose clamps and replace damaged hoses.

3. Test Fuel System Pressure

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "On" position (without starting the engine) to check pressure.
• Ensure the pressure meets the manufacturer's specifications (typically between 40-60 psi for most vehicles). If low, check the fuel pump and filter.

4. Clean or Replace MAF Sensor

• Disconnect the MAF sensor wiring harness.
• Remove the MAF sensor from the intake.
• Clean the sensor with MAF cleaner spray, ensuring no residue is left.
• Reinstall the sensor and wiring harness securely.

5. Inspect Fuel Injectors

• Disconnect the fuel injector connectors.
• Perform a flow test or resistance test to ensure injectors are functioning correctly.
• Replace any faulty injectors with OEM parts.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the error codes and reset the check engine light.