my BMW 3 Series F30/F31 (2012-2019) has check engine code P0302, what does it mean?

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.
• Gather necessary tools and parts.

2. Inspect and Replace Spark Plug

• Remove the ignition coil from cylinder 2.
  • Tools Required: Socket set, ratchet.
  • Safety Warning: Ensure the ignition system is off to avoid electric shock.
• Remove the spark plug from cylinder 2 using a spark plug socket.
• Inspect the spark plug for signs of wear, carbon buildup, or damage.
• Replace with a new spark plug (OEM recommended).
• Reinstall the ignition coil securely.

3. Inspect and Replace Ignition Coil

• If the spark plug appears fine, test the ignition coil for proper operation.
• If faulty, remove the ignition coil from cylinder 2.
• Install a new ignition coil (OEM recommended).
• Reconnect all connectors and ensure proper seating.

4. Test Fuel Injector

• Remove the fuel injector from cylinder 2.
  • Tools Required: Fuel injector puller, safety goggles.
  • Safety Warning: Relieve fuel pressure before disconnection to avoid fuel spray.
• Inspect the fuel injector for clogs or signs of wear.
• Test the injector operation using a fuel injector tester; replace if necessary.

5. Compression Test (if needed)

• Perform a compression test on cylinder 2.
• If compression is low, further inspection may be required for valves or piston rings.
• Repair as necessary based on findings.