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 necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench, spark plug socket, multimeter.
• Remove the engine cover if applicable.
• Disconnect the connector from the ignition coil on cylinder 3.
• Remove the ignition coil using a socket and pull it out gently.
• Inspect the spark plug for wear or fouling; replace if necessary using a spark plug socket.
• Clean the ignition coil terminals and reinstall or replace it if damaged.
• Reconnect the ignition coil and secure it in place.

3. Test and Replace Fuel Injector

• Tools Required: Fuel injector tester or multimeter.
• Disconnect the fuel injector connector for cylinder 3.
• Use a multimeter to measure the resistance of the injector; compare with specifications in the service manual.
• If out of specification, replace the fuel injector.
• Reconnect the fuel injector and ensure it is secured properly.

4. Perform Compression Test

• Tools Required: Compression gauge.
• Remove the spark plug from cylinder 3.
• Insert the compression gauge into the spark plug hole.
• Crank the engine for a few seconds and record the compression reading.
• Compare the reading with manufacturer specifications; if low, investigate potential causes like valve issues or piston damage.

5. Check for Vacuum Leaks

• Tools Required: Smoke machine or carburetor cleaner.
• Inspect vacuum lines around the intake manifold and throttle body for damage or disconnections.
• If using a smoke machine, introduce smoke into the intake system and look for leaks.
• Repair or replace any damaged hoses or components.