how to fix P0171 code on my Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, flashlight, vacuum gauge
• Check for any visible cracks or loose connections in the air intake hoses.
• Use a vacuum gauge to confirm there are no vacuum leaks.
• Tighten or replace any damaged hoses as necessary.

3. Fuel System Check

• Tools Required: Fuel pressure gauge
• Locate the fuel rail and connect the fuel pressure gauge.
• Turn the ignition to the "ON" position (do not start the engine) and check the fuel pressure; it should meet the specifications outlined in the service manual.
• If the pressure is low, inspect the fuel pump and fuel filter, replacing them if necessary.

4. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner (or electrical contact cleaner)
• Disconnect the MAF sensor connector.
• Remove the MAF sensor from the air intake duct.
• Clean the sensor carefully with MAF cleaner and let it dry completely before reinstalling.
• If the sensor is damaged, replace it with a new one.

5. Inspect Fuel Injectors

• Tools Required: Injector cleaning kit or multimeter
• Remove the fuel injectors from the fuel rail.
• Check for clogs and clean them using an injector cleaning kit or replace them if they are faulty.
• Reinstall the fuel injectors, ensuring they are seated properly.