how to resolve P0301 misfire code in BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, torque wrench, compression tester, multimeter, fuel injector tester.
• Allow the engine to cool down before starting work.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Ignition Coil

1. Remove engine cover (if applicable) using a socket set.
2. Disconnect the electrical connector from the ignition coil on cylinder 1.
3. Remove the ignition coil retaining bolt with a socket wrench.
4. Pull out the ignition coil carefully.
5. Install the new ignition coil by reversing the removal steps.

3. Replace Spark Plug

1. Using a spark plug socket, remove the spark plug from cylinder 1.
2. Inspect the old spark plug; replace if it shows signs of wear or fouling.
3. Set the gap of the new spark plug to manufacturer specifications.
4. Install the new spark plug and torque it to the manufacturer’s specified torque rating (usually around 20-25 Nm).
5. Reconnect the ignition coil.

4. Check and Replace Fuel Injector (if necessary)

1. Remove the fuel rail to access the injector for cylinder 1 (may require fuel line depressurization).
2. Disconnect the electrical connector from the fuel injector.
3. Remove the retaining clips and pull out the injector.
4. Install the new fuel injector by reversing the removal steps, ensuring proper seating.
5. Reconnect the fuel rail and electrical connectors.

5. Final Steps

1. Reconnect the negative battery terminal.
2. Clear the error codes from the OBD-II scanner.
3. Start the engine and allow it to reach operating temperature.