how to fix P0302 code on my BMW X3 F25 (2011-2018)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, anti-seize compound.
• Remove the ignition coil from cylinder 2 by unscrewing any retaining bolts and disconnecting the electrical connector.
• Remove the spark plug from cylinder 2 using a spark plug socket.
• Inspect the spark plug for wear, carbon buildup, or damage.
• If necessary, replace the spark plug with a new one, applying anti-seize compound to the threads.
• Torque the spark plug to the manufacturer's specifications (usually around 22 lb-ft for BMW).

3. Check and Replace Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil for cracks or signs of arcing.
• Replace the ignition coil for cylinder 2 if damaged or if misfiring persists after replacing the spark plug.
• Reinstall the ignition coil by securing it and reconnecting the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner, cleaning kit (if needed).
• If misfiring continues, remove the fuel injector from cylinder 2.
• Clean the injector using a fuel injector cleaner spray or ultrasonic cleaning method.
• Reinstall the cleaned or new injector, ensuring proper seating and connection.

5. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle. Monitor for any persistent misfires or check engine light.
• If the issue persists, further investigation into compression and ECM may be necessary.