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

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench, vacuum gauge, cleaning solvent.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Repair Vacuum Leaks

• Sub-steps:
  1. Use a vacuum gauge to check for leaks in the intake system.
  2. Visually inspect all vacuum hoses for cracks or disconnections.
  3. Repair or replace any damaged hoses.
  4. Reconnect any disconnected hoses and ensure all connections are tight.

3. Clean or Replace MAF Sensor

• Sub-steps:
  1. Locate the MAF sensor and disconnect the electrical connector.
  2. Remove the sensor from the air intake duct using a socket.
  3. Clean the MAF sensor with an appropriate MAF cleaner, avoiding any contact with the sensor element.
  4. If the sensor is faulty, replace it with a new MAF sensor.
  5. Reinstall the sensor and reconnect the electrical connector.

4. Inspect and Test Fuel System

• Sub-steps:
  1. Check fuel pressure using a fuel pressure gauge; it should be within manufacturer specifications.
  2. Replace the fuel filter if it shows signs of blockage or if it's due for replacement.
  3. If fuel pressure is low, inspect the fuel pump and relay for proper operation.

5. Examine Oxygen Sensors

• Sub-steps:
  1. Locate the upstream and downstream O2 sensors on bank 2.
  2. Use a multimeter to check the voltage output of the O2 sensor; it should fluctuate between 0.1V and 0.9V.
  3. Replace the O2 sensor if it's not functioning correctly or shows a constant voltage.

6. Final Assembly

• Reconnect the negative battery terminal.
• Clear the P0174 code using the OBD-II scanner.
• Start the engine and allow it to reach operating temperature.