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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery negative terminal to ensure safety.
• Allow the engine to cool down if it has been running.

2. Inspect and Replace Spark Plug

• Remove the ignition coil for cylinder 2:
  • Unscrew the retaining bolt (if applicable).
  • Gently pull the ignition coil out of the spark plug well.
• Remove the spark plug:
  • Use a spark plug socket and ratchet to unscrew the spark plug.
  • Inspect the spark plug for damage, wear, or carbon buildup.
• Install a new spark plug:
  • Apply anti-seize compound to the threads (if recommended).
  • Torque the new spark plug to manufacturer specifications (usually around 18-25 Nm).
• Reinstall the ignition coil and ensure it clicks into place.

3. Check and Replace Ignition Coil (if necessary)

• If the ignition coil is found to be faulty during inspection:
  • Remove the coil from cylinder 2 as described above.
  • Install a new ignition coil, ensuring proper alignment and connection.
  • Reconnect the electrical connector until it clicks.

4. Inspect and Replace Fuel Injector (if necessary)

• If the fuel injector is faulty:
  • Remove the fuel rail (may require depressurizing the system first).
  • Detach the fuel injector from the rail and harness.
  • Install a new fuel injector, ensuring it seats properly.
  • Reinstall the fuel rail and reconnect any necessary hoses.

5. Clear Codes and Test

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0302 code.
• Start the engine and monitor for any check engine light illumination.