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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool before starting any work.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Vacuum gauge, hose clamps, basic hand tools
• Sub-steps:
  1. Use a vacuum gauge to check for vacuum leaks in the intake system.
  2. Visually inspect all vacuum hoses and connections for cracks or disconnections.
  3. Replace any damaged hoses or gaskets identified during the inspection.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, screwdriver
• Sub-steps:
  1. Disconnect the MAF sensor electrical connector.
  2. Remove the MAF sensor from the air intake duct using a screwdriver.
  3. Spray the sensor elements with MAF cleaner and allow it to dry.
  4. Reinstall the sensor and reconnect the electrical connector.

4. Check Fuel System

• Tools Required: Fuel pressure gauge, basic hand tools
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition to the "ON" position without starting the engine to check for proper fuel pressure.
  3. If pressure is below specifications, check the fuel pump and replace if necessary.
  4. Inspect and clean fuel injectors if they show signs of clogging.

5. Inspect and Replace Oxygen Sensors (if necessary)

• Tools Required: Oxygen sensor socket, basic hand tools
• Sub-steps:
  1. Disconnect the oxygen sensor's electrical connector.
  2. Use the oxygen sensor socket to remove the sensor from the exhaust system.
  3. Install the new oxygen sensor and reconnect the electrical connector.