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

Solution

1. Preparation

• Gather required tools and parts.
• Disconnect the vehicle's battery to prevent any electrical issues while working on components.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Visually inspect the air intake hose and connections for cracks or loose fittings.
  3. Replace any damaged hoses or clamps.
  4. If leaks are suspected, use a smoke machine or vacuum gauge to confirm and locate leaks.

3. Check and Clean MAF Sensor

• Tools Required: MAF cleaner spray, Torx screwdriver
• Sub-steps:
  1. Locate the MAF sensor in the air intake path.
  2. Disconnect the electrical connector from the MAF sensor.
  3. Remove the MAF sensor using a Torx screwdriver.
  4. Spray MAF cleaner onto the sensor element and allow it to dry completely.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail service port and remove the cap.
  2. Connect the fuel pressure gauge to the service port.
  3. Turn the ignition to the "ON" position (do not start the engine) to prime the fuel system and check for pressure.
  4. Compare the pressure reading with the manufacturer's specifications (usually around 50-60 PSI for most VW models).
  5. If pressure is low, inspect the fuel pump, filter, and relay for issues.

5. Inspect and Test Oxygen Sensors

• Tools Required: Multimeter
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the electrical connectors from each sensor.
  3. Use a multimeter to check the voltage output of the upstream sensor (should fluctuate between 0.1V and 0.9V).
  4. Replace any faulty sensors.