how to fix P0304 misfire code on Skoda Octavia NFL (2020-Present)

Learn how to diagnose and fix P0304 cylinder 4 misfire in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts.
• Ensure the vehicle is parked on a level surface with the engine off and cool.
• Disconnect the battery's negative terminal to avoid electrical shorts.

2. Replace Spark Plug

• Remove the engine cover if necessary to access the spark plugs.
• Use a spark plug socket and ratchet to unscrew the old spark plug in cylinder 4.
• Inspect the spark plug socket for debris and clean if necessary.
• Apply a small amount of anti-seize lubricant to the threads of the new spark plug.
• Install the new spark plug hand-tight, then torque to the manufacturer’s specification (typically 15-20 lb-ft).

3. Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil in cylinder 4.
• Use a socket set to remove the mounting bolts of the ignition coil.
• Pull the ignition coil straight up to remove it from the spark plug.
• Install the new ignition coil, ensuring it seats properly on the spark plug.
• Reattach the electrical connector and secure the coil with bolts.

4. Check and Replace Fuel Injector (if necessary)

• Disconnect the fuel line from the injector and relieve fuel pressure as per the service manual.
• Remove the electrical connector from the fuel injector.
• Use a socket to remove the fuel injector from its rail.
• Replace it with a new injector, ensuring it is properly seated.
• Reconnect the fuel line and electrical connector, tightening to specifications.

5. Reconnect Battery and Clear Codes

• Reconnect the negative terminal of the battery.
• Use the OBD-II scanner to clear the P0304 trouble code from the system.