Skoda Octavia NFL (2020-Present) rough idle when stopped what's causing it

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is on a level surface and secure it with wheel chocks.
• Disconnect the negative battery terminal to prevent electrical short circuits.

2. Check and Replace Spark Plugs

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coils from the spark plugs.
  3. Use a socket set to remove the old spark plugs.
  4. Inspect the spark plug gap and condition.
  5. Install new spark plugs, ensuring they are gapped correctly (typically 0.028 inches for the Octavia).
  6. Reconnect the ignition coils and replace the engine cover.
• Tools Required: Socket set, torque wrench.
• Safety Warnings: Ensure the engine is cool before working on ignition components.

3. Inspect and Clean Throttle Body

• Sub-steps:
  1. Remove the air intake duct connected to the throttle body.
  2. Clean the throttle body using throttle body cleaner and a soft cloth.
  3. Check the throttle plate for smooth operation; ensure it opens and closes correctly.
  4. Reinstall the air intake duct securely.
• Tools Required: Screwdriver set, throttle body cleaner.
• Safety Warnings: Avoid spraying cleaner into the intake manifold directly.

4. Test and Replace Throttle Position Sensor (if necessary)

• Sub-steps:
  1. Disconnect the electrical connector from the throttle position sensor.
  2. Use a multimeter to check the resistance and voltage output of the TPS based on specifications.
  3. If the readings are outside specifications, remove the old sensor and install a new one.
  4. Reconnect the electrical connector and clear any error codes.
• Tools Required: Multimeter, socket set.
• Safety Warnings: Ensure the ignition is off before disconnecting electrical components.