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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

Tools Required:

• OBD-II scanner
• Vacuum gauge
• Fuel pressure gauge
• Socket set
• Torque wrench
• Clean cloth or MAF sensor cleaner

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all hoses and connections in the intake tract for signs of wear or disconnection.
  2. Use a vacuum gauge to test for leaks; a bouncing needle indicates a potential leak.
  3. Replace any damaged hoses or gaskets found during inspection.

3. Clean MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor, typically found between the air filter and the throttle body.
  2. Remove the MAF sensor by unscrewing the bolts and disconnecting the electrical connector.
  3. Spray MAF sensor cleaner onto the sensor element and allow it to dry before reinstallation.
  4. Reinstall the MAF sensor securely.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Attach the fuel pressure gauge to the fuel rail's test port.
  2. Turn the ignition to the ON position without starting the engine and observe the pressure reading.
  3. Compare the reading to manufacturer specifications; if low, check the fuel pump and filter.
  4. Replace the fuel filter if clogged, and consider replacing the fuel pump if the issue persists.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the fuel injectors.
  2. Inspect each injector for signs of clogging or leakage.
  3. Clean or replace any faulty injectors as necessary.
  4. Reinstall the fuel rail and ensure all connections are secure.