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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before working.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Inspect the air intake hoses and connections.
  • Check for cracks, loose fittings, or damaged hoses. Replace any faulty components.
• Ensure the air filter is clean and not obstructing airflow. Replace if necessary.

3. Check and Clean Mass Airflow Sensor

• Tools Required: MAF cleaner, Torx screwdriver
• Remove the MAF sensor from the intake manifold.
• Spray MAF cleaner on the sensor element; do not touch it directly.
• Allow the sensor to dry completely before reinstalling.

4. Test and Repair Fuel System

• Tools Required: Fuel pressure gauge, line wrenches
• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine to check fuel pressure.
  • If pressure is low, inspect the fuel pump and fuel filter for blockages or failures.
• Replace the fuel filter if it’s clogged and test the fuel pump for proper operation.

5. Inspect and Replace Oxygen Sensors if Necessary

• Tools Required: O2 sensor socket, torque wrench
• Visually inspect the oxygen sensors for damage or excessive carbon buildup.
• If faulty, remove the sensor using an O2 sensor socket and replace it with a new one. Torque to manufacturer specifications.