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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal.

2. Inspect and Repair Intake System

• Tools Required: Screwdriver set, vacuum gauge, flashlight.
• Inspect all vacuum hoses and connections for cracks or disconnections. Replace any damaged hoses.
• Check the intake manifold for leaks using a vacuum gauge; if a leak is present, reseal or replace the intake manifold gasket.

3. Clean MAF Sensor

• Tools Required: MAF sensor cleaner (or electrical contact cleaner), soft cloth.
• Carefully remove the MAF sensor from the air intake duct.
• Spray MAF sensor cleaner onto the sensing elements and allow to dry completely before reinstallation.

4. Check and Repair Fuel System

• Tools Required: Fuel pressure gauge, fuel line disconnect tool.
• Connect a fuel pressure gauge to the fuel rail and check for proper fuel pressure as per manufacturer specifications.
• If pressure is low, inspect and possibly replace the fuel pump or fuel filter.
• Check fuel injectors for proper operation and clean them if necessary.

5. Replace Oxygen Sensors (if needed)

• Tools Required: Oxygen sensor socket, torque wrench.
• Identify the oxygen sensor related to bank 2. Remove the sensor using the oxygen sensor socket.
• Install the new oxygen sensor, tightening it to the manufacturer's specified torque.

6. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the engine and let it idle for a few minutes to ensure all systems are operational.
• Clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to verify that the check engine light does not reappear.