how to fix P0301 code in my BMW 5 Series F10/F11 (2010-2017)?

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug gap tool.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts.
• Carefully lift out the ignition coil.
• Remove the spark plug using a spark plug socket.
• Inspect the old spark plug for wear; replace if necessary.
• Install the new spark plug, ensuring it is gapped correctly (typically 0.028-0.032 inches).
• Torque the spark plug to the manufacturer's specification (usually around 15 ft-lbs).

3. Replace Ignition Coil

• Install the new ignition coil into cylinder 1.
• Reattach the retaining bolts and securely tighten them.
• Connect the electrical connector to the ignition coil until it clicks into place.

4. Fuel Injector Inspection

• If the misfire persists after replacing the spark plug and ignition coil, inspect the fuel injector.
• Remove the fuel rail if necessary to access the injector.
• Check the injector for clogs or damage; replace if needed.
• Reinstall the injector and ensure all connections are secure.

5. Clear Error Codes

• Reconnect the negative battery terminal.
• Use an OBD-II scanner to clear the P0301 code and any other stored codes.
• Start the engine and observe for any reoccurrence of the misfire.