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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety while working on the vehicle.

2. Inspect and Repair Air Intake System

• Sub-steps:

  1. Remove the engine cover if applicable.
  2. Inspect the intake manifold and air ducts for any cracks or loose connections.
  3. Tighten any loose clamps and replace any damaged hoses or ducts.

• Tools Required: Screwdriver set, pliers.

3. Clean or Replace the MAF Sensor

• Sub-steps:

  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the intake system.
  3. If cleaning, use MAF cleaner spray to clean the sensor element gently.
  4. If replacing, install the new MAF sensor and reconnect the electrical connector.

• Tools Required: Torx or socket set, MAF cleaner spray.

4. Check and Repair Vacuum Leaks

• Sub-steps:

  1. Visually inspect all vacuum lines connected to the intake manifold.
  2. Replace any cracked or damaged vacuum hoses.
  3. Use a smoke machine to identify hidden vacuum leaks if necessary.

• Tools Required: Smoke machine (optional), replacement vacuum hoses.

5. Test Fuel Pressure

• Sub-steps:

  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) and check the pressure reading against manufacturer specifications.
  3. If the pressure is low, inspect the fuel pump and fuel filter for issues.

• Tools Required: Fuel pressure gauge.