how to fix P0174 code in Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdrivers, pliers, flashlight
• Sub-steps:
  1. Visually inspect the air intake hoses and connectors for cracks or loose fittings.
  2. Tighten any loose clamps and replace damaged hoses.
  3. Inspect the intake manifold gasket for leaks and replace if necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Spray the sensor with MAF cleaner, allowing it to dry completely.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Check and Adjust Fuel System

• Tools Required: Fuel pressure gauge, wrench
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure. It should match the specifications for your vehicle (typically around 50-60 psi).
  3. If pressure is low, check the fuel pump and filter for blockage and replace as needed.

5. Inspect for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• Sub-steps:
  1. Use a smoke machine to introduce smoke into the intake system and look for leaks.
  2. If a smoke machine is unavailable, spray carburetor cleaner around vacuum connections while the engine is running; if the RPM changes, a leak is present.
  3. Repair or replace any faulty hoses or gaskets.