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

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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool if it has been running.

2. Inspect and Repair Air Intake System

• Inspect Hoses and Gaskets:
  • Visually check all hoses and the intake manifold gasket for cracks or looseness.
  • Replace any damaged hoses or gaskets.
• Tools Required:
  • Socket set
  • Screwdrivers

3. Clean or Replace MAF Sensor

• Cleaning MAF Sensor:

  • Remove the MAF sensor from the air intake duct (typically held by screws or clips).
  • Use MAF sensor cleaner to spray the sensor element, avoiding contact with the wires.
  • Allow it to dry completely before reinstalling.

• Replacing MAF Sensor:

  • If damaged, replace the MAF sensor by disconnecting the electrical connector and removing it from the duct.
  • Install the new sensor and reconnect the electrical connector.

• Tools Required:

  • Torx or socket driver, MAF cleaner

4. Check and Repair Fuel System

• Fuel Pressure Testing:

  • Connect a fuel pressure gauge to the fuel rail.
  • Turn the ignition to the "ON" position without starting to check the initial pressure; refer to manufacturer specs for proper values.
  • If pressure is too low, inspect the fuel pump and fuel filter.

• Inspect Fuel Injectors:

  • Remove the fuel rail to access the injectors.
  • Clean or replace clogged injectors as necessary.

• Tools Required:

  • Fuel pressure gauge, socket set, injector cleaner

5. Final Assembly

• Reassemble any components you removed during inspection and repair.
• Reconnect the negative battery terminal.