how to fix P0174 code on Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety during repairs.

2. Inspect and Repair Vacuum Leaks

• Use a smoke machine or spray soapy water to locate any vacuum leaks in hoses and gaskets.
• If leaks are found, replace damaged hoses or gaskets.
• Ensure all connections are secure and recheck for leaks.

3. Clean or Replace the MAF Sensor

• Remove the MAF sensor from the intake air duct.
• Clean the MAF sensor using MAF cleaner spray. Do not touch the sensor elements with your fingers.
• If the sensor is damaged, replace it with a new unit.
• Reinstall the sensor securely.

4. Check Fuel System

• Use a fuel pressure gauge to test fuel pressure at the fuel rail.
• If the pressure is below specifications, inspect the fuel pump and filter. Replace if necessary.
• Ensure that the fuel injectors are functioning correctly and are not clogged. Cleaning or replacement may be required.

5. Inspect and Test Oxygen Sensors

• Locate the upstream and downstream oxygen sensors.
• Use a multimeter to test the voltage output of the sensors. Reference values should be checked against manufacturer specifications.
• Replace any faulty oxygen sensors.

6. Clear Codes and Test Drive

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0174 code.
• Start the engine and take the vehicle for a test drive to ensure the issue is resolved.