how to fix P0174 code in Genesis G70 IG (2017-2023)

Learn how to diagnose and fix P0174 engine lean condition in Hyundai Genesis G70 (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery cable to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Fuel pressure gauge
• Socket set
• Multimeter
• MAF sensor cleaner
• Torque wrench

2. Inspect and Repair Air Intake System

• Step 1: Visually inspect all hoses and connections in the air intake system for cracks or loose fittings.
• Step 2: If any leaks are found, replace the damaged hoses or tighten the connections.
• Step 3: Check the intake manifold gasket for leaks; replace it if necessary.

3. Check Fuel Pressure

• Step 1: Attach the fuel pressure gauge to the fuel rail.
• Step 2: Turn the ignition to the "ON" position (do not start the engine) and check the pressure reading.
• Step 3: Compare the reading to the manufacturer's specifications; replace the fuel pump or fuel filter if the pressure is low.

4. Clean MAF Sensor

• Step 1: Locate the MAF sensor, usually found in the air intake duct.
• Step 2: Disconnect the electrical connector and remove the sensor.
• Step 3: Spray MAF sensor cleaner on the sensing elements and allow it to dry completely before reinstallation.

5. Inspect and Test Oxygen Sensors

• Step 1: Check the wiring and connectors of the oxygen sensors for any signs of damage or corrosion.
• Step 2: Use a multimeter to test the voltage output of the sensors while the engine is running; compare readings with specifications.
• Step 3: Replace any faulty oxygen sensors.

6. Replace Engine Coolant Temperature Sensor (if necessary)

• Step 1: Locate the coolant temperature sensor, usually near the thermostat housing.
• Step 2: Disconnect the electrical connector and remove the sensor using a socket set.
• Step 3: Install the new sensor and reconnect the electrical connector.