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

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Vacuum Hoses

• Sub-steps:
  • Visually inspect all vacuum hoses for cracks, breaks, or disconnections.
  • Replace any damaged hoses with OEM or high-quality aftermarket parts.
  • Reconnect all hoses securely and ensure they are routed correctly.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner, torque wrench
• Sub-steps:
  • Locate the MAF sensor in the air intake duct.
  • Disconnect the electrical connector and remove the sensor using a socket.
  • Clean the MAF sensor's sensing element with MAF cleaner. Avoid touching the element directly.
  • If the sensor is damaged, replace it with a new one and torque it to the manufacturer's specifications.

4. Test and Repair Fuel System

• Sub-steps:
  • Use a fuel pressure gauge to check the fuel pressure against the manufacturer's specifications.
  • If pressure is low, inspect and replace the fuel filter or fuel pump as necessary.
  • Check fuel injectors for clogs or malfunctions, clean or replace them if required.

5. Clear Codes and Test Drive

• Reconnect the battery and use the OBD-II scanner to clear the P0171 code.
• Test drive the vehicle under various conditions to ensure the check engine light does not return.