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

Solution

1. Preparation

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

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect the air intake hoses and connections for cracks or leaks.
  • Replace any damaged hoses or clamped connections.
  • Clean the throttle body using a throttle body cleaner if necessary.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake.
  • Use MAF cleaner to spray the sensor element carefully, avoiding contact with any components.
  • Reinstall the MAF sensor securely, ensuring proper connections.

4. Test and Repair Fuel System

• Sub-steps:
  • Attach a fuel pressure gauge to the fuel rail.
  • Turn the ignition on (do not start the engine) to check the fuel pressure; it should meet the manufacturer's specifications (typically around 50-60 psi for most VW engines).
  • If pressure is low, inspect the fuel pump and fuel filter for blockages or failures.
  • If necessary, replace the fuel filter or fuel pump.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  • Remove the fuel injectors from the engine.
  • Use an injector cleaning kit or send them to a professional for cleaning.
  • Reinstall the injectors and ensure all seals are intact to prevent leaks.

6. Test Oxygen Sensors

• Sub-steps:
  • Use a multimeter to check the voltage output of the upstream oxygen sensor.
  • If the sensor is outside of the expected voltage range (typically 0.1 to 0.9 volts), replace the sensor.
  • Reconnect the battery and clear the error codes with the OBD-II scanner.