my Skoda Octavia NFL (2020-Present) has a rough idle when cold starting

Solution

1. Preparation

• Gather necessary tools: OBD-II scanner, socket set, torque wrench, multimeter, fuel pressure gauge, throttle body cleaner.
• Ensure the vehicle is on a level surface and the engine is cool.

2. Address Fault Codes

• Using the OBD-II scanner, clear any stored trouble codes after noting them down.
• If the same codes reappear after testing, focus on those specific systems.

3. Inspect and Replace Spark Plugs

• Remove the engine cover if necessary.
• Using the socket set, remove the spark plugs.
• Inspect for wear; replace with OEM equivalent if necessary. Torque the new plugs to manufacturer specifications (typically around 15-20 Nm).

4. Clean the Throttle Body

• Disconnect the throttle body from the intake manifold.
• Use throttle body cleaner and a soft brush to clean the throttle plate and surrounding areas.
• Reinstall the throttle body and torque to specifications.

5. Test and Adjust Fuel System

• Connect the fuel pressure gauge to the fuel rail and start the engine.
• Verify that the fuel pressure is within the manufacturer’s specified range.
• If pressure is low, inspect the fuel filter and pump for issues. Replace as necessary.

6. Replace Engine Coolant Temperature Sensor (if faulty)

• Locate the coolant temperature sensor and disconnect the electrical connector.
• Remove the sensor using the appropriate socket.
• Install the new sensor and reconnect the electrical connector, ensuring it is seated properly.