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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, spark plug socket, torque wrench
• Remove the ignition coil from cylinder 2 by unscrewing the retaining bolts.
• Carefully pull out the ignition coil.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for wear or fouling; replace if necessary.
• Install a new spark plug (torque to specifications, typically around 18-22 lb-ft).
• Reinstall the ignition coil and secure it with bolts.

3. Check and Replace Ignition Coil (if necessary)

• If the ignition coil appears faulty during inspection, proceed to replace it.
• Tools Required: Socket set, multimeter (for testing)
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from the cylinder.
• Install the new ignition coil and reconnect the electrical connector.

4. Inspect and Replace Fuel Injector (if necessary)

• If the fuel system is suspected to be the issue, check the fuel injector for cylinder 2.
• Tools Required: Fuel injector removal tool, socket set
• Disconnect the fuel injector connector.
• Remove the fuel rail if necessary to access the injector.
• Replace the fuel injector if it’s clogged or malfunctioning.