what does it mean if my Genesis G70 IG (2017-2023) has code P0174

Learn how to diagnose and fix P0174 lean air-fuel mixture issue in Genesis G70 (2017-2023). Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle's battery to prevent electrical issues.
• Allow the engine to cool before starting any work.

2. Inspect and Repair Vacuum Leaks

• Visually inspect all vacuum hoses and connections for cracks or disconnections.
• Use a smoke machine or carburetor cleaner to identify leaks.
• Replace any damaged hoses and reconnect all loose connections.

3. Clean or Replace MAF Sensor

• Locate the MAF sensor in the intake air duct.
• Disconnect the electrical connector and remove the sensor.
• Clean the MAF sensor using MAF cleaner spray; allow it to dry.
• If the sensor is damaged, replace it with a new one.
• Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Delivery

• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition on (do not start the engine) and check the fuel pressure against manufacturer specifications.
• If pressure is low, inspect the fuel pump and replace the fuel filter if necessary.

5. Inspect Oxygen Sensors

• Locate the upstream and downstream oxygen sensors on exhaust bank 2.
• Check the wiring and connectors for damage.
• Use a multimeter to test the sensors' voltage output while the engine is running.
• Replace any malfunctioning oxygen sensors.