how to fix P0302 misfire code in BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Disconnect the ignition coil connector from cylinder 2.
• Remove the ignition coil using a socket set.
• Remove the spark plug using a spark plug socket.
• Inspect the gap and condition of the new spark plug; replace if necessary.
• Install the new spark plug and torque to the manufacturer's specifications (typically around 20 Nm).
• Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil is faulty, remove the old coil by unscrewing it from its mount.
• Install the new ignition coil, ensuring it is seated properly.
• Reconnect the ignition coil connector.

4. Inspect and Clean Fuel Injector (if necessary)

• Remove the fuel rail if it is obstructing access to the fuel injector.
• Disconnect the fuel injector connector and remove the injector from its rail.
• Clean the injector with a suitable cleaning solution or replace it if defective.
• Reinstall the injector and reconnect the connector.

5. Reassemble and Test

• Reinstall any components removed during the repair (e.g., engine cover).
• Reconnect the battery.
• Start the engine and allow it to reach operating temperature.