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

Solution

1. Preparation

• Tools Required: OBD-II scanner, vacuum gauge, fuel pressure gauge, multimeter, basic hand tools.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect for Vacuum Leaks

• Sub-steps:
  1. Visual inspection of all vacuum hoses and connections for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner around suspected areas while the engine is running to identify leaks.
  3. Repair or replace any damaged hoses or gaskets.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the MAF sensor connector and remove the sensor from the intake.
  2. Use MAF sensor cleaner to gently clean the sensor, avoiding physical contact with the sensing elements.
  3. Reinstall the MAF sensor and reconnect the connector.

4. Check Fuel Pressure

• Sub-steps:
  1. Locate the fuel pressure test port on the fuel rail.
  2. Connect the fuel pressure gauge to the test port.
  3. Turn the ignition to the "ON" position (without starting) and check the pressure reading; it should match the manufacturer’s specifications.
  4. If pressure is low, inspect the fuel pump and filter for issues.

5. Inspect and Test Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the sensors and use a multimeter to check their resistance and voltage output following the manufacturer’s specifications.
  3. Replace any faulty oxygen sensors.

6. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Visually inspect for any leaks or clogs.
  3. Use a fuel injector cleaning kit to clean each injector or replace if they are malfunctioning.