how to fix P0171 code in Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Gather tools and parts required for repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  • Visually inspect all vacuum hoses and gaskets for cracks or disconnections.
  • Use a smoke machine to detect hidden leaks if necessary.
  • Replace any damaged hoses or gaskets found during the inspection.
• Tools Required: Smoke machine, basic hand tools.

3. Clean or Replace MAF Sensor

• Sub-steps:
  • Locate the MAF sensor in the intake system.
  • Disconnect the electrical connector and unscrew the sensor from its housing.
  • Clean the sensor with MAF cleaner spray and let it dry. If the sensor is damaged, replace it with a new one.
• Tools Required: Screwdriver set, MAF cleaner spray.

4. Check and Repair Fuel System

• Sub-steps:
  • Inspect the fuel pump and filter for any clogs or failures.
  • Measure the fuel pressure at the fuel rail using a fuel pressure gauge.
  • Replace the fuel filter if it is clogged.
  • If the fuel pressure is low, consider replacing the fuel pump.
• Tools Required: Fuel pressure gauge, basic hand tools, replacement fuel filter or pump as needed.

5. Clear Codes and Test Drive

• Sub-steps:
  • Reconnect the battery.
  • Use the OBD-II scanner to clear the P0171 code.
  • Test drive the vehicle to ensure the issue has been resolved.
• Tools Required: OBD-II scanner.