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

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Sub-steps:

  1. Visually inspect all vacuum hoses for cracks or disconnections.
  2. Use a smoke machine to identify hidden leaks if necessary.
  3. Replace any damaged hoses or fittings as required.

• Tools Required: Smoke machine (optional), screwdriver set.

3. Clean MAF Sensor

• Sub-steps:

  1. Disconnect the MAF sensor wiring harness.
  2. Remove the MAF sensor from the air intake duct.
  3. Clean the sensor using MAF cleaner spray and a soft cloth.
  4. Allow the sensor to dry completely before reinstallation.

• Tools Required: Torx screwdriver, MAF cleaner.

4. Check Fuel Delivery

• Sub-steps:

  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn on the ignition without starting the engine to check the fuel pressure.
  3. Compare the reading with the manufacturer's specifications (typically around 55-65 PSI for a Golf MK7).
  4. If pressure is low, inspect the fuel pump and filter for issues and replace if necessary.

• Tools Required: Fuel pressure gauge.

5. Clean Throttle Body

• Sub-steps:

  1. Remove the air intake hose connected to the throttle body.
  2. Use throttle body cleaner and a soft brush to clean the throttle plate and surrounding area.
  3. Reassemble all components and ensure a tight seal.

• Tools Required: Throttle body cleaner, brush, socket set.