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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle battery to prevent any electrical shorts.
• Allow the engine to cool down if previously running.

2. Replace Spark Plug

1. Locate the Spark Plug:
   • Remove engine cover if applicable using a socket set.
2. Remove the Old Spark Plug:
   • Use a spark plug socket and ratchet to remove the spark plug from cylinder 1.
3. Inspect the Spark Plug:
   • Check for signs of wear, damage, or carbon buildup.
4. Install New Spark Plug:
   • Apply anti-seize compound to the threads of the new spark plug.
   • Install the new spark plug hand-tight, then torque to manufacturer specifications (typically around 15 Nm).

3. Replace Ignition Coil

1. Disconnect the Ignition Coil Connector:
   • Carefully unplug the electrical connector from the ignition coil.
2. Remove the Ignition Coil:
   • Unscrew the bolts securing the ignition coil and gently pull it out.
3. Install New Ignition Coil:
   • Insert the new ignition coil into the cylinder head and secure it with bolts.
   • Reconnect the electrical connector.

4. Check and Replace Fuel Injector (if necessary)

1. Access the Fuel Injector:
   • Remove any necessary components to gain access to the fuel rail.
2. Disconnect Fuel Injector Connector:
   • Unplug the electrical connector from the injector.
3. Remove the Fuel Injector:
   • Remove bolts securing the fuel rail, then gently pull the injector out.
4. Install New Fuel Injector:
   • Lubricate the O-ring of the new injector with clean engine oil.
   • Insert the new injector into the rail and reconnect the electrical connector.

5. Reassemble and Test

• Reinstall any components that were removed during the process.
• Reconnect the vehicle battery.
• Start the engine and check for smooth operation.