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

Solution

1. Preparation

• Tools Required: OBD-II scanner, vacuum gauge, fuel pressure gauge, basic socket set, cleaning supplies for MAF sensor.
• Ensure the vehicle is parked on a flat surface and the ignition is off before starting.

2. Inspect the Air Intake System

• Sub-steps:
  1. Visually inspect the intake hoses and connections for cracks or damage.
  2. Use a vacuum gauge to check for vacuum leaks within the intake manifold.
  3. If any leaks are found, replace or repair the affected components.

3. Clean the Mass Air Flow (MAF) Sensor

• Sub-steps:
  1. Disconnect the MAF sensor connector.
  2. Remove the MAF sensor from the intake tube.
  3. Spray MAF cleaner onto the sensor elements and allow it to dry completely before reinstallation.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Test Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail service port.
  2. Turn the ignition on without starting the engine to check the fuel pressure.
  3. Compare the reading to the manufacturer's specifications. Replace the fuel pump or filter if pressure is below specifications.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Visually check for fuel leaks around the injectors.
  2. Use a noid light or multimeter to test the operation of the injectors while the engine is running.
  3. Clean or replace any clogged or malfunctioning injectors as necessary.

6. Check Engine Coolant Temperature Sensor

• Sub-steps:
  1. Locate the coolant temperature sensor and disconnect the electrical connector.
  2. Use a multimeter to test the resistance of the sensor at operating temperature and compare it to specifications.
  3. Replace the sensor if it is out of specification.