how to fix P0303 code in 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.
• Ensure the vehicle is parked on a flat surface, and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Replace Spark Plug

• Remove the ignition coil cover if required.
• Disconnect the ignition coil connector and remove the coil from cylinder 3.
• Use a spark plug socket to remove the spark plug from cylinder 3.
• Inspect the spark plug for wear; replace it with a new one if necessary (ensure it is gapped correctly per manufacturer specifications).
• Reinstall the spark plug and ignition coil, securing it properly and reconnecting the connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil showed signs of damage, replace it with a new one.
• Ensure proper seating in the cylinder head and reconnect the electrical connector.

4. Check Compression (if misfire persists)

• Remove the spark plug from cylinder 3.
• Insert a compression gauge into the spark plug hole.
• Crank the engine and record the compression reading. Compare it to manufacturer specifications.
• If compression is low, further investigation into the engine's internal condition is needed.

5. Inspect Fuel Injector (if necessary)

• Access the fuel injector for cylinder 3.
• Disconnect the electrical connector and remove the fuel rail if needed.
• Inspect the injector for clogs; clean or replace if necessary.