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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the vehicle battery to ensure safety.
• Tools Required: OBD-II scanner, socket set, fuel pressure gauge, MAF sensor cleaner, vacuum gauge.

2. Inspect and Repair Air Intake System

• Sub-steps:
  1. Remove the engine cover (if applicable) using a socket set.
  2. Inspect the air intake hoses and connections for cracks or looseness.
  3. Replace any damaged hoses with OEM parts.
  4. Tighten any loose connections to prevent air leaks.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor from the air intake duct using a socket set.
  3. Clean the MAF sensor using MAF sensor cleaner. Allow it to dry completely.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Check Fuel Pressure

• Sub-steps:
  1. Locate the fuel rail on the engine.
  2. Connect the fuel pressure gauge to the service port on the fuel rail.
  3. Turn the ignition key to the "On" position without starting the engine and check the reading.
  4. If the pressure is below specifications, consider replacing the fuel pump or fuel filter.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Disconnect the fuel injector connectors.
  2. Perform a visual inspection for any leaks or cracks.
  3. If necessary, remove the injectors and clean them or replace them with new units.

6. Replace ECT Sensor (if needed)

• Sub-steps:
  1. Locate the ECT sensor on the engine.
  2. Disconnect the electrical connector and remove the sensor using a socket set.
  3. Install the new ECT sensor and reconnect the electrical connector.