how to fix P0171 code in Volkswagen Golf MK7 (2015-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Vacuum Leaks

• Tools Required: Hose clamp pliers, vacuum gauge
• Visually inspect all vacuum hoses for cracks or disconnections.
• Use a vacuum gauge to test the intake manifold for leaks.
• Replace any damaged hoses or gaskets.

3. Check and Replace MAF Sensor (if faulty)

• Tools Required: Torx screwdriver, MAF cleaner
• Locate the MAF sensor on the intake tube.
• Disconnect the electrical connector and remove the sensor using the Torx screwdriver.
• Clean the sensor using MAF cleaner and inspect for damage. Replace if necessary.

4. Fuel Pressure Check and Repair

• Tools Required: Fuel pressure gauge
• Connect the fuel pressure gauge to the fuel rail.
• Turn the ignition to the ON position (do not start the engine) and check the pressure reading against manufacturer specifications.
• If pressure is low, inspect the fuel pump, fuel filter, and fuel lines for blockages or failures. Replace any faulty components.

5. Inspect Throttle Body

• Tools Required: Socket set, throttle body cleaner
• Remove the intake duct connected to the throttle body.
• Inspect for carbon buildup and clean the throttle body using throttle body cleaner.
• Reassemble the intake duct securely.