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

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Sub-step 1: Visually inspect all vacuum hoses for cracks or disconnections.
• Sub-step 2: Apply a smoke test to the intake system to find hidden leaks.
• Sub-step 3: Replace any damaged hoses or gaskets identified during inspection.

3. Check and Replace Fuel Filter (if necessary)

• Sub-step 1: Locate the fuel filter (refer to the service manual for specific location).
• Sub-step 2: Relieve fuel system pressure by removing the fuel pump fuse and starting the engine until it stalls.
• Sub-step 3: Disconnect the fuel lines from the filter using a line removal tool.
• Sub-step 4: Replace the old fuel filter with a new one and reconnect the fuel lines.
• Tools Required: Line removal tool, wrenches, and a catch container for fuel.

4. Inspect and Clean the MAF Sensor

• Sub-step 1: Disconnect the MAF sensor connector.
• Sub-step 2: Remove the sensor from the intake duct.
• Sub-step 3: Clean the sensor using MAF sensor cleaner spray. Do not touch the sensor element.
• Sub-step 4: Reinstall the sensor and reconnect the connector.

5. Test Fuel Injectors

• Sub-step 1: Remove the fuel injector rail assembly (if accessible) and inspect injectors for clogs.
• Sub-step 2: Clean the injectors using an ultrasonic cleaner or replace them if necessary.
• Sub-step 3: Reinstall the injector rail and ensure all connections are secure.