how to fix a misfire on my Volkswagen Golf MK7 (2015-2019) with code P0302?

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal.
• Allow the engine to cool.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Use a spark plug socket to remove the spark plug from cylinder 2.
• Inspect the removed spark plug for signs of wear or damage (e.g., carbon buildup, excessive gap).
• Install a new spark plug, ensuring the gap is set to manufacturer specifications (typically around 0.028-0.032 inches).
• Torque the spark plug to the manufacturer-recommended value (usually around 15 lb-ft).

3. Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil for cylinder 2.
• Remove the mounting bolts and lift the ignition coil out of the cylinder head.
• Install the new ignition coil, ensuring it seats properly.
• Reconnect the electrical connector securely.

4. Check Fuel Injector

• If the misfire persists, check the fuel injector for cylinder 2.
• Remove the electrical connector from the injector.
• Test the injector with a noid light to ensure it is receiving a signal.
• If the injector is faulty, remove it using a fuel injector puller, and install a new injector. Ensure it is seated correctly and reconnect the electrical connector.

5. Reassemble

• Reinstall any components removed, including the engine cover.
• Reconnect the negative battery terminal.