my Volkswagen Golf MK7.5 (2020-Present) has a P0171 code, what should I do

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool before beginning work.

2. Inspect and Repair Air Intake System

• Sub-steps:
  • Visually check the entire air intake for cracks or loose connections.
  • If leaks are found, replace the damaged hoses or clamps.
  • Clean the MAF sensor using MAF cleaner spray if it appears dirty.

3. Check and Repair Fuel System

• Sub-steps:
  • Connect the fuel pressure gauge to the fuel rail.
  • Start the engine and observe the fuel pressure; it should be within the manufacturer's specifications (typically 50-60 psi for most Volkswagen engines).
  • If pressure is low, check the fuel pump and filter; replace if necessary.

4. Inspect Fuel Injectors

• Sub-steps:
  • Remove the fuel injectors from the fuel rail.
  • Clean or replace clogged injectors as needed.
  • Reinstall the injectors ensuring proper sealing and connection.

5. Test Oxygen Sensor

• Sub-steps:
  • Use a multimeter to check the voltage output of the oxygen sensor.
  • If the sensor does not provide a signal within the specified range (usually around 0.1 to 0.9 volts), consider replacing it.