how to fix P0171 code on my Skoda Octavia NFL (2020-Present)

Learn how to diagnose and fix P0171 engine lean condition in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all tools and parts required.
• Ensure the vehicle is parked on a level surface and the engine is cool.

2. Inspect and Repair Air Intake System

• Tools Required: Screwdriver set, vacuum gauge.
• Inspect the intake hoses and connections for cracks or leaks.
• Tighten any loose clamps or replace damaged hoses.
• Use a vacuum gauge to test for leaks in the intake system.

3. Check and Clean MAF Sensor

• Tools Required: MAF sensor cleaner.
• Disconnect the electrical connector from the MAF sensor.
• Remove the MAF sensor from the air intake duct.
• Clean the sensor with MAF sensor cleaner and allow it to dry completely before reinstalling.

4. Test Fuel Pressure

• Tools Required: Fuel pressure gauge.
• Locate the fuel pressure test port on the fuel rail.
• Connect the fuel pressure gauge and turn the ignition to the “ON” position (do not start the engine).
• Check the pressure reading against manufacturer specifications; it should typically be between 50-60 psi.
• If the pressure is low, inspect the fuel pump and fuel filter.

5. Replace Fuel Filter (if needed)

• Tools Required: Wrench set, container to catch fuel.
• Relieve the fuel system pressure by removing the fuel pump relay and starting the engine until it stalls.
• Disconnect the fuel lines from the fuel filter.
• Remove the old filter and install the new one in the correct orientation.
• Reconnect the fuel lines and reinstall the fuel pump relay.

6. Test and Replace O2 Sensors (if necessary)

• Tools Required: O2 sensor socket.
• Inspect the upstream O2 sensor for functionality; use a multimeter to check the signal.
• If faulty, remove the sensor using the O2 sensor socket and replace it with a new one.
• Ensure the new sensor is correctly installed and connected.