how to fix P0174 code in my Skoda Octavia NFL (2020-Present)

Learn how to diagnose and fix P0174 lean air-fuel mixture in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Inspect and Repair Vacuum Leaks

• Sub-step 1: Visually inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Sub-step 2: Use a smoke machine to detect any hidden vacuum leaks.
• Sub-step 3: Replace any damaged hoses or components as needed.

3. Clean MAF Sensor

• Sub-step 1: Carefully remove the MAF sensor from the air intake duct.
• Sub-step 2: Use MAF sensor cleaner to spray the sensing element; do not touch it with tools or fingers.
• Sub-step 3: Allow the sensor to air dry completely before reinstalling.

4. Test and Replace Fuel Pressure Regulator (if necessary)

• Sub-step 1: Connect a fuel pressure gauge to the fuel rail.
• Sub-step 2: Turn the ignition to the "ON" position without starting the engine to check the fuel pressure.
• Sub-step 3: Compare the reading to the manufacturer's specifications; if low, replace the fuel pressure regulator.

5. Inspect and Clean Fuel Injectors

• Sub-step 1: Remove the fuel injectors from the fuel rail.
• Sub-step 2: Use a fuel injector cleaner kit to clean each injector.
• Sub-step 3: Reinstall the cleaned injectors with new O-rings.

6. Replace Oxygen Sensors (if needed)

• Sub-step 1: Identify the oxygen sensor associated with Bank 2.
• Sub-step 2: Use an oxygen sensor socket to remove the old sensor.
• Sub-step 3: Install the new oxygen sensor and torque it to the specified value (typically around 30 Nm).