how to fix P0171 code in Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety during repairs.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect all air intake hoses and connections for cracks or leaks.
  • Tighten or replace any loose or damaged hoses as necessary.
  • If a leak is found, replace the faulty component (e.g., hoses, clamps).

3. Test and Clean the MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Clean the MAF sensor with MAF cleaner spray, avoiding any contact with the sensor element.
  • Reinstall the MAF sensor securely in its place.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail test port.
  • Turn the ignition on (engine off) and record the fuel pressure reading.
  • If the pressure is below specifications (usually around 50-60 psi), inspect the fuel pump and fuel filter for faults.
  • Replace the fuel filter if clogged and consider replacing the fuel pump if it fails to deliver proper pressure.

5. Inspect and Clean Fuel Injectors

• Sub-steps:
  • Remove the fuel injectors from the fuel rail.
  • Use a fuel injector cleaner kit to clean the injectors, or replace them if they are found to be faulty.
  • Reinstall the injectors and ensure that they are properly seated.

6. Reconnect Battery and Clear Codes

• Reconnect the battery terminal.
• Use the OBD-II scanner to clear the P0171 code from the system.