how to fix P0174 code in Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks or disconnections.
  • Tighten or replace any damaged hoses.
  • Inspect the intake manifold gasket for leaks and replace if necessary.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner or isopropyl alcohol, soft cloth
• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the sensor using MAF cleaner; do not touch the sensor element.
  • Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel System

• Sub-steps:
  • Attach a fuel pressure gauge to the fuel rail test port.
  • Turn the ignition on (do not start) to check fuel pressure. The typical pressure should be within manufacturer specifications (refer to service manual).
  • If pressure is low, check the fuel pump, fuel filter, and fuel lines for blockages or failures.

5. Inspect Throttle Body

• Sub-steps:
  • Remove the throttle body from the intake manifold.
  • Clean the throttle body using throttle body cleaner and a soft cloth.
  • Reinstall the throttle body, ensuring all connections are secure.

6. Test and Replace Fuel Injectors (if needed)

• Sub-steps:
  • Test each injector for proper operation using a multimeter or injector tester.
  • If faulty, remove and replace the injector with a new one.
  • Ensure correct installation and secure all connections.