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

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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool before starting disassembly.

2. Inspect Air Intake System

• Tools Required: Socket set, torque wrench, flashlight
• Sub-steps:
  1. Remove the engine cover (if applicable) using the socket set.
  2. Inspect all air intake hoses for cracks or disconnections.
  3. Tighten any loose clamps and replace damaged hoses as needed.
  4. Reassemble the intake system and ensure all connections are secure.

3. Clean or Replace MAF Sensor

• Tools Required: MAF cleaner, small screwdriver
• Sub-steps:
  1. Locate the MAF sensor in the air intake duct.
  2. Disconnect the electrical connector carefully.
  3. Remove the MAF sensor using the screwdriver.
  4. Clean the sensor using MAF cleaner, or replace it if damaged.
  5. Reinstall the MAF sensor and reconnect the wiring harness.

4. Check Fuel Delivery System

• Tools Required: Fuel pressure gauge
• Sub-steps:
  1. Locate the fuel rail and connect the fuel pressure gauge.
  2. Turn the ignition to the "ON" position without starting the engine to check the fuel pressure reading.
  3. Compare the reading with manufacturer specifications (typically found in the repair manual).
  4. If pressure is low, inspect the fuel pump and filter for clogs or failures, replacing as necessary.

5. Inspect Oxygen Sensors

• Tools Required: Socket set
• Sub-steps:
  1. Locate the oxygen sensors, particularly the one related to Bank 2.
  2. Disconnect the wiring harness and remove the oxygen sensor.
  3. Inspect the sensor for damage or contamination.
  4. Replace the sensor if it fails inspection.
  5. Reinstall the oxygen sensor and reconnect the wiring.