how to fix P0171 code in Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Tools Required: OBD-II scanner, fuel pressure gauge, multimeter, socket set, screwdrivers, cleaning supplies, safety glasses.
• Disconnect the battery to prevent any electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Air Intake System

• Inspect for Vacuum Leaks:
  • Visually check all vacuum hoses and the intake manifold for cracks or disconnections.
  • Use a smoke machine or carb cleaner to identify leaks if necessary.
• Repair any found leaks by replacing hoses or gaskets as needed.

3. Check and Clean MAF Sensor

• Remove MAF Sensor:
  • Locate the MAF sensor on the air intake duct.
  • Disconnect the electrical connector and unscrew the sensor from the duct.
• Clean the MAF Sensor:
  • Use MAF cleaner spray to clean the sensing elements.
  • Allow it to dry completely before reinstallation.
• Reinstall the MAF Sensor and reconnect the electrical connector securely.

4. Test and Replace Fuel Components

• Test Fuel Pressure:
  • Connect the fuel pressure gauge to the fuel rail test port.
  • Turn the ignition on (do not start the engine) and check the pressure reading against manufacturer specifications.
• If pressure is low, check the fuel pump relay and fuses, and consider replacing the fuel pump if it is not functioning properly.
• Inspect Fuel Injectors:
  • Remove the fuel rail to visually check for leaks or clogs in the injectors.
  • Clean or replace injectors as necessary.

5. Reconnect and Clear Codes

• Reconnect the battery and use the OBD-II scanner to clear the P0171 code.
• Perform a test drive to monitor for any recurrence of the check engine light.