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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Ensure the vehicle is on a level surface and secure with wheel chocks.

2. Inspect and Repair Vacuum Leaks

• Step 1: Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnected ends.
• Step 2: Use a smoke machine or carb cleaner to identify small leaks in the vacuum system.
• Step 3: Replace any damaged hoses or gaskets as needed.
• Tools Required: Smoke machine or carb cleaner, screwdriver set.

3. Clean or Replace the MAF Sensor

• Step 1: Disconnect the MAF sensor connector and unscrew it from the intake.
• Step 2: Clean the sensor using MAF cleaner spray; avoid touching the sensor element.
• Step 3: If cleaning does not resolve the issue, replace the MAF sensor with a new one.
• Tools Required: MAF cleaner spray, Torx screwdriver.

4. Check Fuel Delivery

• Step 1: Access the fuel pressure test port on the fuel rail.
• Step 2: Attach a fuel pressure gauge and turn the ignition to the "ON" position without starting the engine to check the pressure.
• Step 3: Compare the reading with the manufacturer’s specifications; replace the fuel pump or filter if below specifications.
• Tools Required: Fuel pressure gauge.

5. Clear Codes and Test Drive

• Step 1: Reconnect the negative battery terminal.
• Step 2: Use the OBD-II scanner to clear the P0174 code from the ECM.
• Step 3: Perform a test drive to monitor for any reoccurrence of the code and check engine performance.