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

Solution

1. Preparation

• Gather necessary 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

• Tools Required: Vacuum gauge, hose clamps, repair tape.
• Steps:
  1. Use a vacuum gauge to check for leaks in the vacuum system.
  2. Inspect all vacuum hoses for cracks or disconnections.
  3. Replace any damaged hoses or use repair tape for minor leaks.
  4. Reconnect any disconnected hoses securely.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver.
• Steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Spray MAF sensor cleaner on the sensor element and let it dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Turn the ignition on (do not start the engine) and check the pressure reading.
  3. Compare the reading to the manufacturer's specifications.
  4. If pressure is low, inspect the fuel pump and fuel filter for issues.

5. Inspect and Clean Fuel Injectors

• Tools Required: Fuel injector cleaning kit, socket set.
• Steps:
  1. Remove the fuel injectors from the fuel rail.
  2. Use a fuel injector cleaning kit to clean the injectors thoroughly.
  3. Reinstall the injectors, ensuring proper sealing and connections.
  4. Reconnect the fuel rail and ensure there are no leaks.