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

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the engine cover if necessary.
  2. Check all vacuum hoses connected to the intake manifold for cracks or disconnections; replace if necessary.
  3. Inspect the intake manifold gasket; replace if there are signs of wear or damage.
  4. Reassemble any components that were removed.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector carefully.
  3. Remove the MAF sensor using the appropriate socket.
  4. If cleaning, use MAF sensor cleaner and follow instructions for cleaning; if replacing, install the new sensor.
  5. Reconnect the electrical connector and ensure it is secure.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  1. Connect a fuel pressure gauge to the fuel rail.
  2. Turn the ignition to the "on" position (do not start) to check the pressure reading; it should be within the manufacturer's specifications.
  3. If the pressure is low, inspect the fuel pump and fuel filter and replace if necessary.
  4. Disconnect the gauge and reconnect any components removed.

5. Verify Exhaust System Integrity

• Sub-steps:
  1. Inspect for any visible leaks in the exhaust system, particularly around the manifold and joints.
  2. If leaks are found, repair or replace the damaged sections of the exhaust.