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

Solution

1. Preparation

• Gather tools: OBD-II scanner, fuel pressure gauge, multimeter, basic hand tools, and cleaning supplies.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  2. Use a smoke machine or carburetor cleaner to identify leaks. If you see or hear smoke or notice a change in engine idle, you have found a leak.
  3. Replace any damaged hoses or gaskets as necessary.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor in the air intake system.
  2. Disconnect the electrical connector and remove the sensor from the intake.
  3. Clean the MAF sensor with MAF cleaner spray; do not touch the sensor with any tools.
  4. Reinstall the sensor and reconnect the electrical connector. If it is damaged, replace it.

4. Check Fuel Pressure

• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail Schrader valve.
  2. Turn the ignition to the "ON" position without starting the engine and read the fuel pressure.
  3. Compare the reading to manufacturer specifications; it should typically be between 40-60 psi.
  4. If the pressure is low, check the fuel pump and replace if necessary.

5. Inspect Fuel Injectors

• Sub-steps:
  1. Remove the fuel rail to access the injectors.
  2. Check for any clogs or leaks by visually inspecting the injectors.
  3. Clean the injectors using a fuel injector cleaner kit or replace them if necessary.