how to resolve the P0302 misfire code in my BMW 5 Series G30/G31 (2017-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative terminal of the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 2.
• Remove the ignition coil from cylinder 2.
• Unscrew and remove the spark plug from cylinder 2.
• Install the new spark plug and torque to manufacturer specifications (typically around 18-22 ft-lbs).
• Reinstall the ignition coil and reconnect the connector.

3. Test/Replace Ignition Coil

• Tools Required: Socket set, multimeter
• If the spark plug appears fine, test the ignition coil using a multimeter to check resistance.
• If out of specification, replace the ignition coil for cylinder 2.
• Reinstall the new coil and ensure the connector is secure.

4. Inspect/Replace Fuel Injector

• Tools Required: Fuel injector puller, socket set
• Disconnect the fuel injector connector for cylinder 2.
• Remove the fuel rail if necessary to access the fuel injector.
• Inspect the injector for clogs or damage.
• If faulty, replace the fuel injector.
• Reconnect the fuel rail and injector connector.

5. Conduct Compression Test (if necessary)

• Tools Required: Compression tester
• Remove the spark plug for cylinder 2.
• Insert the compression tester into the spark plug hole.
• Crank the engine to get a compression reading.
• Compare the reading with manufacturer specifications; if low, further investigation is required (i.e., valve issues, head gasket).