how to address 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 System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Sub-steps:
  1. Visually inspect all hoses and connections in the air intake system.
  2. Use a vacuum gauge to check for leaks in vacuum lines.
  3. Replace any damaged or cracked hoses.

3. Clean or Replace Mass Airflow Sensor

• Tools Required: MAF cleaner spray, screwdriver
• Sub-steps:
  1. Disconnect the electrical connector from the MAF sensor.
  2. Remove the MAF sensor using a screwdriver.
  3. Clean the sensor with MAF cleaner spray; allow it to dry thoroughly.
  4. Reinstall the MAF sensor and reconnect the electrical connector.

4. Inspect and Repair Fuel System

• Tools Required: Fuel pressure gauge, wrenches
• Sub-steps:
  1. Connect the fuel pressure gauge to the fuel rail.
  2. Start the engine and check if the fuel pressure is within the manufacturer's specifications (typically around 50-60 psi).
  3. If fuel pressure is low, inspect the fuel pump and filter for clogs or failures.
  4. Replace the fuel filter if necessary and consider replacing the fuel pump if it is faulty.

5. Inspect and Test Oxygen Sensors

• Tools Required: Multimeter
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors.
  2. Disconnect the sensors and check their resistance with a multimeter.
  3. If the readings are outside the specification, replace the faulty oxygen sensors.