my Skoda Octavia NFL (2020-Present) has a rough idle when warm what should I check

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, vacuum gauge, fuel pressure gauge, cleaning supplies (throttle body cleaner, rags).
• Disconnect the negative battery terminal to ensure safety before starting any work.

2. Addressing Error Codes

• Use the OBD-II scanner to retrieve and document error codes.
• Clear the codes and perform a test drive to see if they reappear.

3. Inspect and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect ignition coils and unscrew the spark plugs using a socket.
  3. Inspect the spark plugs for wear; replace if necessary (OEM recommended gap).
  4. Reinstall new spark plugs and torque to manufacturer specifications.

4. Clean the Throttle Body

• Sub-steps:
  1. Remove the intake duct to access the throttle body.
  2. Spray throttle body cleaner inside the throttle body and use a soft cloth to remove carbon deposits.
  3. Reassemble the intake duct securely.

5. Check Fuel Pressure

• Sub-steps:
  1. Attach the fuel pressure gauge to the fuel rail.
  2. Start the engine and monitor pressure; it should be within manufacturer specifications.
  3. If the pressure is low, consider replacing the fuel pump or fuel filter.

6. Inspect Vacuum Lines

• Sub-steps:
  1. Visually inspect all vacuum lines for cracks or disconnections.
  2. Replace any damaged lines and ensure all connections are secure.