how to resolve the P0174 code in 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 Vacuum Leaks

• Tools Required: Vacuum gauge, smoke machine (optional).
• Use the vacuum gauge to check for leaks; a reading below the manufacturer's specification indicates a leak.
• If a leak is found, replace damaged hoses or seals. If using a smoke machine, introduce smoke into the intake system and look for smoke escaping.

3. Clean or Replace the MAF Sensor

• Tools Required: MAF sensor cleaner, torx driver.
• Remove the MAF sensor from the intake duct.
• Spray MAF sensor cleaner on the sensing elements, avoiding contact with electrical components.
• Allow it to dry completely before reinstalling. If damaged, replace the MAF sensor with a new unit.

4. Check and Adjust Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Attach the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the "On" position (do not start) to check the fuel pressure reading; it should match the specifications found in the service manual.
• If the pressure is low, inspect the fuel pump and fuel filter for issues, replacing them as necessary.

5. Inspect and Clean Fuel Injectors

• Tools Required: Injector cleaning kit or ultrasonic cleaner, basic hand tools.
• Remove fuel injectors from the engine.
• Use an injector cleaning kit or ultrasonic cleaner to clean the injectors thoroughly.
• Reinstall the injectors securely, ensuring no leaks are present.