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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle battery negative terminal to ensure safety.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Vacuum Lines

• Sub-steps:
  1. Visually inspect all vacuum lines connected to the intake manifold for any signs of wear or damage.
  2. Replace any damaged or cracked vacuum hoses with new ones.
  3. Ensure all connections are tight and secure.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the air intake duct.
  3. Clean the sensor with MAF sensor cleaner; do not touch the sensor element.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Fuel System Check

• Sub-steps:
  1. Locate the fuel rail and connect a fuel pressure gauge to the test port.
  2. Turn the ignition to the ON position (without starting the engine) to check the fuel pressure.
  3. Compare the reading to the manufacturer's specifications; replace the fuel pump or filter if pressure is low.
  4. Inspect the fuel injectors and clean or replace them if necessary.

5. Oxygen Sensor Inspection

• Sub-steps:
  1. Locate the oxygen sensors (pre and post-catalytic converter).
  2. Inspect the wiring and connectors for any damage.
  3. Use a multimeter to test the sensors for proper operation.
  4. Replace any faulty oxygen sensors.