how to fix P0302 misfire code on my BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather tools and parts required for repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Remove the engine cover (if applicable) using a ratchet and socket.
• Remove the ignition coil for cylinder 2 by unscrewing the bolts and gently pulling it out.
• Use a spark plug socket to remove the old spark plug from cylinder 2.
• Inspect the spark plug gap and replace it with a new spark plug (use OEM or recommended aftermarket parts).
• Torque the new spark plug to the manufacturer's specifications (typically around 20 Nm).

3. Inspect and Replace Ignition Coil

• If the ignition coil was faulty, replace it with a new one specific to the BMW F10/F11 model.
• Reinstall the ignition coil by connecting it to the spark plug and securing it with bolts.
• Reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• If necessary, remove the fuel rail to access the fuel injector for cylinder 2.
• Check for clogs or leaks in the injector. Clean or replace if necessary.
• Reinstall the fuel injector and ensure proper sealing.

5. Reassembly

• Reinstall any components removed (engine cover, etc.).
• Reconnect the negative battery terminal.