why does my Volkswagen Golf MK7.5 (2020-Present) have a check engine light with code P0174?

Solution

1. Preparation

• Gather required tools and parts.
• Make sure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge.
• Remove the air intake duct to inspect for cracks or looseness.
  • Check all hoses for signs of wear or damage.
  • Replace any faulty hoses or ducts with OEM parts.
• Reassemble the air intake duct and ensure all clamps are tightened properly.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, small screwdriver.
• Locate the MAF sensor along the air intake path.
• Disconnect the electrical connector and remove the MAF sensor.
• Clean the sensor with MAF cleaner, ensuring not to touch the sensor element.
• If sensor is damaged, replace it with a new one.

4. Check Fuel System

• Tools Required: Fuel pressure gauge.
• Connect the fuel pressure gauge to the fuel rail test port.
• Turn the ignition to the ON position (do not start) and check the fuel pressure.
  • Compare the pressure reading to the manufacturer's specifications.
  • If pressure is low, inspect the fuel pump and replace if necessary.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit (if necessary), multimeter (for electrical testing).
• Visually inspect fuel injectors for leaks and proper seating.
• If injectors are clogged, consider using an injector cleaning kit or replace them.

6. Check for Exhaust Leaks

• Tools Required: Smoke machine (optional) or visual inspection tools.
• Inspect the exhaust system components, focusing on areas before the oxygen sensors.
• Repair any leaks found, as these can cause false readings and affect fuel mixture.