how to fix P0171 code in Volkswagen Golf Seventh Generation (2013-2020)

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to ensure safety.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, vacuum gauge
• Remove the engine cover if applicable.
• Inspect all hoses and connections for cracks or disconnections.
• Use a vacuum gauge to check for leaks. Repair or replace any faulty components detected.

3. Clean or Replace MAF Sensor

• Tools Required: Torx screwdriver, MAF cleaner spray
• Locate the MAF sensor between the air filter and throttle body.
• Disconnect the electrical connector and remove the sensor.
• Clean the MAF sensor with MAF cleaner spray and let it dry.
• Reinstall the sensor and reconnect the electrical connector.

4. Check and Repair Fuel Delivery System

• Tools Required: Fuel pressure gauge, socket set
• Attach the fuel pressure gauge to the fuel rail.
• Turn the ignition to the "on" position (do not start the engine) to check the pressure.
• Compare the pressure reading with manufacturer specifications; if low, check the fuel pump and filter.
• Replace the fuel filter if clogged and ensure the fuel pump is functioning correctly.

5. Inspect Fuel Injectors

• Tools Required: Socket set, fuel injector cleaner
• Remove the fuel rail to access the injectors.
• Inspect each injector for clogs or leaks.
• If necessary, clean injectors using a fuel injector cleaning kit or replace them.