how to fix P0171 code in my Volkswagen Golf MK7 (2015-2019)?

Solution

1. Preparation

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

2. Inspect Air Intake System

• Remove the air filter housing and inspect for cracks or loose connections.
• Replace any damaged hoses or clamps.

3. Clean or Replace MAF Sensor

• Detach the MAF sensor from the air intake duct.
• Use MAF cleaner to gently clean the sensor elements.
• If cleaning does not resolve issues, replace the MAF sensor.

4. Check Fuel Pressure

• Attach the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "ON" position without starting the engine and check the pressure reading.
• If pressure is below specifications (usually around 50-60 PSI for the Golf MK7), consider replacing the fuel pump or checking the fuel filter.

5. Inspect and Clean Fuel Injectors

• Remove the fuel rail and inspect the injectors for clogs.
• Use a fuel injector cleaner or replace the injectors if necessary.

6. Check Vacuum Lines

• Inspect all vacuum lines for cracks or breaks.
• Replace any defective vacuum lines and ensure all connections are secure.