how to fix P0171 code in Volkswagen Golf Eighth Generation (2020-present)?

Solution

1. Preparation

• Gather tools and parts required.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool completely before starting work.

2. Inspect and Repair Vacuum Leaks

• Tools Needed: Hose clamp pliers, vacuum gauge
• Use a vacuum gauge to check for leaks in the intake system.
• Replace any damaged or cracked hoses and ensure all clamps are secure.

3. Clean or Replace the MAF Sensor

• Tools Needed: MAF sensor cleaner or electrical contact cleaner, screwdriver
• Remove the MAF sensor using a screwdriver.
• Clean the sensor with MAF cleaner; allow it to dry completely before reinstalling.
• If cleaning does not resolve the issue, replace the MAF sensor with a new one.

4. Test and Repair Fuel System

• Tools Needed: Fuel pressure gauge, wrench set
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition key to the ON position (do not start) and check the pressure reading; it should match manufacturer specifications.
• If the pressure is low, check the fuel pump and filter for issues. Replace as necessary.

5. Check Fuel Injectors

• Tools Needed: Injector cleaning kit, socket set
• Remove the fuel injectors and visually inspect them for blockages or leaks.
• Clean the injectors using an injector cleaning kit or replace them if they are faulty.

6. Replace Engine Coolant Temperature Sensor (if necessary)

• Tools Needed: Socket set, coolant
• Locate the engine coolant temperature sensor and disconnect the wiring harness.
• Remove the sensor using a socket.
• Install the new sensor and reconnect the wiring harness. Refill any lost coolant.