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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify any leaks.
  3. Replace any damaged hoses or gaskets found during inspection.
• Tools Required:
  • Smoke machine or carburetor cleaner
  • Screwdrivers
  • Pliers

3. Clean or Replace the MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor connector.
  2. Remove the MAF sensor from the air intake duct.
  3. Clean the sensor with MAF cleaner spray and let it dry.
  4. Reinstall the MAF sensor and reconnect the electrical connector.
• Tools Required:
  • Torx screwdriver
  • MAF cleaner spray

4. Check Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure.
  3. The pressure should meet manufacturer specifications (typically around 50-60 psi).
  4. If low, inspect the fuel pump and filter for potential replacement.
• Tools Required:
  • Fuel pressure gauge
  • Wrenches

5. Inspect and Replace Oxygen Sensor (if needed)

• Sub-steps:
  1. Locate the downstream oxygen sensor on bank 2.
  2. Disconnect the sensor connector and remove the oxygen sensor using an O2 sensor socket.
  3. Install the new oxygen sensor and reconnect the electrical connector.
• Tools Required:
  • Oxygen sensor socket
  • Wrench