how to fix P0302 misfire code on my BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

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

2. Inspect Spark Plug

• Remove the spark plug from cylinder 2 using a spark plug socket.
• Inspect for wear or fouling; replace if necessary.
• Torque the new spark plug to manufacturer specifications (typically around 18-22 ft-lbs).

3. Check and Replace Ignition Coil

• Remove the ignition coil from cylinder 2 by unfastening any retaining bolts.
• Inspect the ignition coil for cracks or damage.
• If defective, install a new ignition coil and ensure it is seated properly.

4. Inspect Fuel Injector

• Disconnect the fuel injector electrical connector and remove it from cylinder 2.
• Check for clogs using a multimeter to test the injector’s resistance (should meet specifications).
• Replace the injector if it is faulty or clogged.

5. Perform Compression Test

• Remove the spark plugs and set the throttle to wide open.
• Use a compression tester to measure the compression in cylinder 2.
• Compare results to manufacturer specifications; repair any issues if compression is low (possible head gasket or valve issues).

6. Reassemble and Reconnect

• Reinstall all components in the reverse order, ensuring all connections are secure.
• Reconnect the battery and clear the error codes using the OBD-II scanner.