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

Solution

1. Preparation

• Gather tools and parts.
• Disconnect the negative battery terminal to avoid electrical shorts.
• Allow the engine to cool down completely.

2. Remove the Spark Plug

• Tools Required: Socket set with spark plug socket, torque wrench.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector for cylinder 1.
• Unscrew and remove the ignition coil.
• Use the spark plug socket to carefully remove the spark plug from cylinder 1.
• Inspect the spark plug for signs of wear, fouling, or damage.

3. Inspect and Replace Ignition Coil

• Check the ignition coil visually for cracks or damage.
• If defective, install a new ignition coil for cylinder 1.
• Ensure proper alignment and connection of the new ignition coil.
• Reconnect the ignition coil connector.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaning kit (if needed).
• Disconnect the fuel injector connector.
• Remove the fuel injector from cylinder 1.
• Inspect for clogs or debris; clean if necessary, or replace if faulty.
• Reinstall the fuel injector ensuring a secure fit.

5. Reinstall Spark Plug and Components

• Install a new spark plug into cylinder 1, ensuring it is torqued to the manufacturer’s specifications (typically around 18-22 lb-ft).
• Reinstall the ignition coil and reconnect the electrical connector.
• Replace the engine cover if removed.

6. Clear Error Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to erase the P0301 code from the vehicle's computer.