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 during repairs.

2. Inspect Air Intake System

• Tools Required: Hose clamp pliers, flashlight
• Visually inspect all air intake hoses and connections for cracks or loose fittings.
• Tighten any loose clamps and replace damaged hoses.
• Check the intake manifold gasket for leaks and replace if necessary.

3. Check Fuel Pressure

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition to the ON position without starting the engine to check for initial fuel pressure.
• Compare the reading to the manufacturer’s specifications (typically around 50-60 psi for the Golf MK7.5).
• If pressure is low, inspect the fuel pump and filter for issues.

4. Inspect and Clean MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the air intake.
• Spray the MAF cleaner onto the sensor element and allow it to dry completely before reinstalling.

5. Examine Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter
• Locate the oxygen sensors (pre-catalytic converter and post-catalytic converter).
• Use a multimeter to test the voltage output of the sensors while the engine is running; it should fluctuate between 0.1V and 0.9V.
• Replace any faulty oxygen sensors.

6. Check Fuel Injectors

• Tools Required: Injector tester or multimeter
• Disconnect the fuel injectors from their connectors.
• Use the injector tester to ensure injectors are firing correctly; replace any that are faulty.