how to fix P0174 code in Volkswagen Golf MK7 (2015-2019)?

Solution

1. Preparation

• Gather tools and safety equipment.
• Disconnect the negative battery terminal.
• Allow the engine to cool.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, socket set
• Use a vacuum gauge to test for leaks in the intake system.
• Visually inspect hoses and connections for cracks or disconnections.
• Replace any damaged hoses and ensure all connections are secure.

3. Check and Clean the Mass Airflow Sensor (MAF)

• Tools Required: MAF cleaner spray, screwdriver
• Remove the MAF sensor from the air intake duct.
• Spray MAF cleaner on the sensor element and let it dry completely.
• Reinstall the MAF sensor ensuring it is correctly positioned.

4. Test and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge, fuel line disconnect tool
• Connect the fuel pressure gauge to the fuel rail.
• Start the engine and check the fuel pressure against the manufacturer specifications (typically around 50-60 psi).
• If pressure is low, inspect the fuel pump and filter; replace as needed.

5. Inspect Exhaust System

• Tools Required: Visual inspection tools, possibly a lift
• Inspect the exhaust system visually for cracks or holes, particularly around the O2 sensors.
• Repair or replace any damaged exhaust components.

6. Clear Codes and Test Drive

• Reconnect the battery terminal.
• Clear the P0174 code using the OBD-II scanner.
• Test drive the vehicle to monitor for any reoccurrence of the code.