my Skoda Octavia NFL (2020-Present) has a check engine light and is running rough, what to do?

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, fuel pressure gauge, smoke machine.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool before starting any work.

2. Replace Faulty Spark Plugs

1. Remove the engine cover (if applicable) using a socket set.
2. Disconnect the ignition coils from the spark plugs.
3. Use a spark plug socket to carefully remove the old spark plugs.
4. Inspect the old plugs for wear or damage.
5. Install new spark plugs, torqueing them to the manufacturer’s specified value (usually around 15-20 Nm).
6. Reconnect the ignition coils and replace the engine cover.

3. Fix Air Intake Issues

1. Inspect the air filter; if dirty, replace it with a new one.
2. Check the air intake hoses for cracks or loose connections.
3. If a leak is found, replace the affected hoses.

4. Address Fuel System Issues

1. Connect the fuel pressure gauge to the fuel rail.
2. Turn the ignition to the ON position (without starting the engine) to check pressure.
3. If pressure is below specifications, replace the fuel filter and inspect the fuel pump.
4. Reconnect the fuel pressure gauge and clear any fuel lines.

5. Check for Vacuum Leaks

1. Use a smoke machine to introduce smoke into the intake system.
2. Look for smoke escaping from any hoses or connections.
3. Replace any damaged hoses or gaskets found during the inspection.