how to fix P0303 misfire code on my Skoda Octavia NFL (2020-Present)

Learn how to diagnose and fix P0303 cylinder 3 misfire in Skoda Octavia NFL. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil by unscrewing the securing bolts and disconnecting the electrical connector.
• Extract the spark plug using a spark plug socket. Check for wear or fouling.
• Install a new spark plug with the correct gap specification (check manufacturer’s manual for exact gap).
• Torque the spark plug to the manufacturer’s specified value (typically around 20 Nm, but verify).

3. Replace Ignition Coil

• Tools Required: Ratchet set, socket set.
• Remove the ignition coil for cylinder 3 following the same procedure as above.
• Install a new ignition coil, ensuring it is seated properly.
• Reconnect the electrical connector and secure any bolts.

4. Clean or Replace Fuel Injector

• Tools Required: Fuel injector removal tool, cleaning solvent (if cleaning).
• Disconnect the fuel line from the injector and relieve fuel pressure.
• Remove the fuel injector by unscrewing it from the intake manifold.
• Inspect the injector for clogs; clean it or replace it if necessary.
• Reinstall the injector, ensuring proper seating and connection.

5. Reassemble and Test

• Reconnect the battery.
• Start the engine and check for any check engine lights or misfire symptoms.
• Conduct a test drive to ensure the vehicle operates smoothly.