how to fix P0174 code in Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before working on components.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or loose connections.
  2. Tighten any loose clamps and replace any damaged hoses.
  3. If necessary, remove the air filter and clean the airbox.
• Tools Required: Screwdriver set, hose clamp pliers.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor from the duct.
  3. Use MAF cleaner to spray the sensor's wire and allow it to dry.
  4. Reinstall the MAF sensor and reconnect the electrical connector.
• Tools Required: Torx screwdriver, MAF cleaner.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail test port.
  2. Start the engine and observe the fuel pressure reading.
  3. If the pressure is below specifications (consult repair manual), replace the fuel filter or fuel pump as needed.
• Tools Required: Fuel pressure gauge, socket set.

5. Inspect Vacuum Lines

• Sub-steps:
  1. Locate all vacuum lines connected to the intake manifold.
  2. Check for cracks and loose connections; replace any damaged lines.
  3. Use smoke testing if necessary to identify hard-to-find leaks.
• Tools Required: Smoke machine (optional), hose clamp pliers.

6. Test and Repair Fuel Injectors

• Sub-steps:
  1. Disconnect the fuel injector connectors and remove the injectors from the rail.
  2. Test each injector for proper resistance with a multimeter.
  3. Clean or replace any injectors that do not meet specifications.
• Tools Required: Multimeter, injector cleaning kit.