how to fix the P0171 code on my Volkswagen Golf Eighth Generation (2020-present)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent any electrical issues while working on the vehicle.

2. Inspect and Repair Air Intake System

• Tools Required: Socket set, screwdrivers, vacuum gauge
• Remove the air intake duct and inspect for cracks or loose fittings.
• If any leaks are found, replace the damaged sections of the duct or re-secure loose connections.
• Reinstall the air intake duct and ensure all connections are tight.

3. Clean or Replace MAF Sensor

• Tools Required: MAF sensor cleaner or isopropyl alcohol, soft brush
• Carefully remove the MAF sensor from the air intake system.
• Spray the MAF sensor with MAF cleaner and allow it to dry completely.
• If the sensor is damaged or cleaning does not resolve the issue, replace it with a new one.

4. Inspect Fuel Delivery System

• Tools Required: Fuel pressure gauge, socket set
• Connect the fuel pressure gauge to the fuel rail and turn the ignition on (do not start the engine) to check for proper fuel pressure.
• If the pressure is low, check the fuel pump and fuel filter for blockages or failures. Replace as necessary.
• Inspect fuel injectors for proper operation, and clean or replace if clogged.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner
• With the engine running, use a smoke machine to detect vacuum leaks around hoses and the intake manifold.
• Alternatively, spray carburetor cleaner around suspected areas while the engine is running; if the RPM changes, a leak is present.
• Replace any damaged vacuum hoses or gaskets.

6. Verify Oxygen Sensor Operation

• Tools Required: Multimeter or OBD-II scanner
• Use a multimeter to check the voltage output of the oxygen sensor(s) while the engine is running.
• If the readings are outside the normal range, replace the faulty oxygen sensor.