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

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all air intake hoses and connections for cracks or disconnections.
  • Tighten or replace any loose or damaged hoses.
  • Use a smoke machine if necessary to identify leaks.

3. Clean or Replace Mass Airflow Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor.
  • Clean the MAF sensor using MAF cleaner; do not touch the sensing element.
  • If the sensor is damaged, replace it with a new one.
  • Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect Fuel Delivery System

• Sub-steps:
  • Locate the fuel pump and filter.
  • Use a fuel pressure gauge to check fuel pressure; it should match manufacturer specifications.
  • If pressure is low, inspect the fuel filter for clogs and replace if necessary.
  • If the fuel pump is faulty, remove it and replace it with a new unit.

5. Check and Repair Vacuum Leaks

• Sub-steps:
  • Inspect all vacuum lines visually for cracks or breaks.
  • Use a smoke test to identify hard-to-see leaks.
  • Replace any damaged vacuum lines.

6. Reconnect Battery and Clear Codes

• Sub-steps:
  • Reconnect the negative battery terminal.
  • Use the OBD-II scanner to clear the P0171 code.
  • Start the engine and allow it to reach operating temperature.