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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Repair Air Intake

• Tools Required: Socket set, screwdrivers, flashlight, vacuum gauge
• Sub-steps:
  1. Visually inspect all air intake hoses for cracks or loose connections.
  2. Tighten any loose clamps.
  3. Replace any damaged hoses.
  4. Use a vacuum gauge to check for any leaks in the intake manifold.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector and remove the sensor.
  3. Clean the sensor with MAF sensor cleaner; allow it to dry completely.
  4. If the sensor is damaged, replace it with a new one.
  5. Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect Fuel System

• Tools Required: Fuel pressure gauge, socket set
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail test port.
  2. Turn the ignition key to the "ON" position (do not start the engine) and check the fuel pressure reading; it should meet manufacturer specifications.
  3. If the pressure is low, check the fuel pump and fuel filter for clogs or failures.
  4. Replace the fuel filter if needed and ensure the fuel pump is functioning properly.

5. Check and Repair Vacuum Leaks

• Tools Required: Smoke machine (optional), vacuum gauge
• Sub-steps:
  1. Use a smoke machine to introduce smoke into the intake system to identify leaks.
  2. Visually inspect all vacuum lines and connections; replace any that are cracked or damaged.
  3. Ensure all connections are secure.

6. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0171 code.