how to fix P0301 misfire code on my Skoda Octavia NFL (2020-Present)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, multimeter, compression tester, and shop manual.
• Ensure the vehicle is on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil:
  1. Unplug the electrical connector.
  2. Remove the bolts securing the coil.
  3. Gently pull the coil out of the spark plug hole.
• Remove the spark plug:
  1. Use a socket and ratchet to unscrew the spark plug from cylinder 1.
  2. Inspect for wear, carbon deposits, or damage; replace if necessary.
• Install a new spark plug:
  1. Set the gap according to manufacturer specifications.
  2. Install the new spark plug and torque to the specified value (typically around 22 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

• If the spark plug is in good condition, test the ignition coil:
  1. Swap the ignition coil with another cylinder.
  2. Clear the error codes and start the engine to see if the misfire moves to the swapped cylinder.
• If the misfire follows the coil, replace it with a new one.
• Torque the new ignition coil to the manufacturer's specifications.

4. Inspect Fuel Injector

• Check the fuel injector for cylinder 1:
  1. Disconnect the fuel injector connector.
  2. Use a multimeter to check for proper voltage and resistance.
  3. If faulty, replace the fuel injector.
• Reconnect the electrical connector after replacement.

5. Perform Compression Test

• If misfire persists, conduct a compression test:
  1. Remove the spark plug from cylinder 1.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and record the compression reading.
• Compare the reading to the manufacturer’s specifications. If low, further engine diagnostics may be needed.