how to fix P0171 code in Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather necessary tools and materials.
• Ensure the vehicle is parked on a flat surface, and the engine is off and cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually inspect the air intake hoses for cracks or damage.
  • Replace any damaged hoses with new OEM parts.
  • Ensure all connections are secure and free of debris.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the air intake system.
  • Disconnect the electrical connector and remove the sensor.
  • Use MAF sensor cleaner to gently clean the sensor element.
  • Allow it to dry completely before reinstalling or replace if damaged.

4. Check and Repair Fuel System

• Sub-steps:
  • Attach a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "On" position without starting the engine to check pressure.
  • If pressure is low, inspect the fuel pump relay, fuse, and wiring.
  • Replace the fuel filter if it hasn’t been changed recently.

5. Inspect Fuel Injectors

• Sub-steps:
  • Remove the fuel injectors from the fuel rail.
  • Use a multimeter to test each injector for resistance.
  • If any injector fails the resistance test, replace it.
  • Clean the injectors using a professional cleaning service if they are clogged.