how to fix P0301 misfire code in BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery negative terminal to ensure safety.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover (if applicable).
• Use the spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear or fouling; replace if necessary.
• Install the new spark plug and torque it to the manufacturer’s specifications (typically 22 Nm).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set, torque wrench.
• Disconnect the electrical connector from the ignition coil above cylinder 1.
• Remove the ignition coil bolt and carefully pull the coil out.
• Replace with a new ignition coil and secure it with the bolt, torquing to manufacturer specifications (typically 10 Nm).

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaner kit (if cleaning is needed).
• Disconnect the fuel injector connector and remove the fuel rail bolts.
• Carefully remove the fuel injector from cylinder 1.
• Clean the injector using a fuel injector cleaning kit or replace it with a new one.
• Reinstall the injector, ensuring it is seated properly, and reattach the fuel rail.

5. Reassemble and Test

• Reconnect all electrical connectors and reinstall any components removed during the repair.
• Reconnect the battery terminal.
• Start the engine and allow it to reach operating temperature.