how to fix the P0174 code on my 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, socket set, torque wrench, multimeter, fuel pressure gauge, vacuum gauge.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Repair Air Intake System

1. Visually inspect all air intake hoses for cracks or damage.
2. Tighten any loose clamps and replace any damaged hoses.
3. If leaks are detected, replace the affected components.
4. Reconnect the battery.

3. Check and Clean MAF Sensor

1. Locate the MAF sensor in the air intake system.
2. Disconnect the electrical connector from the MAF sensor.
3. Using MAF sensor cleaner, spray the sensor element carefully without touching it.
4. Allow it to dry completely before reconnecting the sensor.

4. Fuel System Inspection

1. Connect the fuel pressure gauge to the fuel rail.
2. Turn the ignition to the "On" position without starting the engine to check the fuel pressure.
3. Compare the reading to the manufacturer’s specifications.
4. If pressure is low, check the fuel pump and filter for clogs or failures. Replace if necessary.

5. Vacuum Leak Test

1. Connect a vacuum gauge to a suitable vacuum source.
2. Start the engine and monitor the vacuum reading.
3. If the reading is below specifications, inspect hoses and gaskets for leaks.
4. Use smoke testing if needed to find hard-to-detect vacuum leaks.

6. Check Fuel Injectors

1. Use a multimeter to test the resistance of each fuel injector.
2. If any injectors are out of specification, replace them.
3. Clean the injectors using a professional cleaning kit if they are clogged.