how to fix P0302 code in BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Compression tester
• Multimeter
• Fuel injector cleaner (if needed)

2. Inspect and Replace Spark Plug

1. Remove the engine cover (if applicable) for access.
2. Disconnect the ignition coil connector from cylinder 2.
3. Remove the ignition coil using the appropriate socket.
4. Unscrew the spark plug from cylinder 2 using a spark plug socket.
5. Inspect the spark plug for wear, cracks, or carbon buildup. Replace if necessary.
6. Install a new spark plug, torque it to the manufacturer’s specification (typically around 15 ft-lbs).
7. Reinstall the ignition coil and reconnect the connector.

3. Test and Replace Ignition Coil (if necessary)

1. If the spark plug is in good condition, test the ignition coil using a multimeter to measure resistance (consult service manual for specifications).
2. If the coil is faulty, replace it with a new one. Ensure the new coil matches OEM specifications.
3. Reconnect the ignition coil and ensure it is seated properly.

4. Check Fuel Injector

1. If the ignition components are functioning properly, test the fuel injector for cylinder 2.
2. Use a multimeter to check for voltage at the injector connector while cranking the engine.
3. If there is no voltage, inspect the wiring and connectors for damage.
4. If voltage is present but the injector is not functioning, replace the fuel injector.
5. Clean the fuel injector with an appropriate fuel injector cleaner if it appears clogged.

5. Verify and Reassemble

1. Reconnect the battery.
2. Clear diagnostic trouble codes using the OBD-II scanner.
3. Start the engine and observe for any misfire symptoms.
4. Ensure all connections are secure and reassemble any components that were removed.