how to fix P0303 misfire code on my Volkswagen Golf Eighth Generation (2020-present)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool if it has been running.

2. Replace Spark Plug and Ignition Coil

• Tools Required: Spark plug socket, ratchet, torque wrench, ignition coil puller (if needed).
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 3.
• Remove the ignition coil by unscrewing the retaining bolts.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for wear; replace with a new spark plug if necessary.
• Install the new spark plug and torque it to the manufacturer's specification (usually 22 ft-lbs).
• Install the new ignition coil and reconnect the connector.

3. Check and Replace Fuel Injector (if necessary)

• Tools Required: Fuel injector puller, appropriate socket set.
• Disconnect the fuel injector connector for cylinder 3.
• Remove the fuel rail (if applicable) to access the fuel injector.
• Pull out the fuel injector using a fuel injector puller.
• Inspect the fuel injector for clogs or damage; replace if necessary.
• Reinstall the fuel injector and reconnect the fuel rail, ensuring proper sealing.

4. Reassemble and Test

• Reinstall any engine covers that were removed.
• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.