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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical issues.
• Allow the engine to cool if it has been running.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect the air filter and replace if dirty or clogged.
  2. Check all air intake hoses and connections for cracks or looseness. Replace any damaged components.
  3. Ensure that the MAF sensor is properly connected and free from obstructions.
• Tools Required: Screwdriver set, pliers, flashlight.

3. Test and Clean MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor connector.
  2. Remove the MAF sensor using a Torx screwdriver.
  3. Clean the MAF sensor with MAF cleaner spray. Allow it to dry before reinstalling.
  4. Reinstall the MAF sensor and reconnect the wiring harness.
• Tools Required: Torx screwdriver, MAF cleaner spray.

4. Check and Adjust Fuel System

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail to check for proper pressure (specifications should be found in the service manual).
  2. If the pressure is low, check the fuel pump and fuel filter. Replace if necessary.
  3. Inspect and clean fuel injectors using a fuel injector cleaner solution or replace if clogged.
• Tools Required: Fuel pressure gauge, fuel injector cleaning kit.

5. Inspect Vacuum Lines

• Sub-steps:
  1. Visually inspect all vacuum lines connected to the intake manifold for cracks or disconnections.
  2. Replace any faulty vacuum lines.
  3. Test for leaks using a smoke machine or by spraying soapy water on connection points.
• Tools Required: Smoke machine (optional), soapy water in a spray bottle.