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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum lines and the intake manifold gasket for signs of cracks or disconnections.
  • Use a smoke machine or propane torch (carefully) to identify leaks.
  • If any leaks are found, replace the damaged hoses or gaskets.

3. Clean or Replace the MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the intake path.
  • Disconnect the electrical connector and remove the MAF sensor.
  • Clean the MAF sensor using MAF cleaner spray; do not touch the sensor element.
  • If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Check Fuel Pressure

• Sub-steps:
  • Locate the fuel pressure test port on the fuel rail.
  • Attach the fuel pressure gauge to the test port.
  • Start the engine and check the fuel pressure against the manufacturer’s specifications (usually around 50-60 psi).
  • If pressure is low, inspect the fuel pump, filter, and lines for issues; replace faulty components.

5. Inspect and Test Fuel Injectors

• Sub-steps:
  • Remove the fuel injectors from the fuel rail.
  • Check for clogs by performing a flow test or visually inspecting them.
  • Clean the injectors using a professional injector cleaning kit or replace them if necessary.