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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to prevent any electrical shorts.
• Ensure the engine is cool before starting any work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamp pliers.
• Inspect all vacuum hoses for damage or disconnections. Replace any damaged hoses.
• Use a vacuum gauge to check for proper vacuum levels. If low, trace back to find the leak.
• Tighten or replace any loose connections or clamps.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Disconnect the MAF sensor electrical connector.
• Remove the MAF sensor from the air intake duct using a screwdriver.
• Clean the sensor carefully with MAF sensor cleaner. Allow it to dry completely before reinstalling.
• Reattach the MAF sensor and its connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, socket set.
• Connect a fuel pressure gauge to the fuel rail.
• Turn the ignition on (do not start the engine) and check the pressure; it should match specifications (usually around 50-60 psi for most VW engines).
• If the pressure is low, inspect the fuel pump, fuel filter, and fuel lines for blockages or failures.

5. Inspect Oxygen Sensors

• Tools Required: O2 sensor socket, multimeter.
• Disconnect the upstream and downstream oxygen sensors from the exhaust.
• Use a multimeter to test the resistance and voltage output of the sensors per manufacturer specifications.
• Replace any faulty oxygen sensors as necessary.