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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle's battery to ensure safety.
• Raise the vehicle if necessary and secure with jack stands.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses and connections for signs of wear or damage.
  • Use a smoke machine or carburetor cleaner to identify leaks while the engine is running.
  • Replace any faulty hoses or gaskets with OEM (Original Equipment Manufacturer) parts.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Remove the MAF sensor from the air intake duct.
  • Clean the MAF sensor using MAF cleaner spray; do not touch the sensor elements.
  • Allow it to dry completely before reinstalling.
  • If damaged, replace the MAF sensor with a new OEM part.

4. Check and Adjust Fuel Pressure

• Sub-steps:
  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position (do not start) and check the fuel pressure reading.
  • If the pressure is below specifications (typically around 50-60 psi), inspect the fuel pump and fuel filter for issues.
  • Replace the fuel pump or filter if necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the fuel rail to access the injectors.
  • Inspect each injector for clogs or leaks.
  • Clean the injectors using a professional cleaning kit or replace them if they are faulty.