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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the battery to prevent electrical shorts.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Remove the ignition coil for cylinder 2:
  • Disconnect the electrical connector.
  • Unbolt the coil using a socket set.
  • Remove the ignition coil from the cylinder head.
• Remove the spark plug:
  • Use a spark plug socket to carefully unscrew and remove the spark plug.
  • Inspect the spark plug for signs of fouling or damage.
• Install the new spark plug:
  • Apply a small amount of anti-seize compound to the threads (if recommended).
  • Torque the spark plug to the manufacturer’s specifications (typically around 20 Nm).
• Reinstall the ignition coil:
  • Position the coil back into place and secure it with bolts.
  • Reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil was faulty:
  • Replace the old ignition coil with a new one.
  • Ensure it is seated properly and reconnect the electrical connector.

4. Check Fuel Injector

• If the spark plug and ignition coil are functioning correctly:
  • Remove the fuel injector from cylinder 2:
    • Detach the electrical connector and fuel line.
    • Unscrew the injector retaining clips.
  • Inspect the injector for clogs or damage.
  • Replace the injector if necessary and reinstall it properly.

5. Test and Reassemble

• Reconnect the battery and start the engine.
• Monitor the engine for smooth operation and check for any reoccurring codes.

Tools Required:

• OBD-II scanner
• Socket set
• Torque wrench
• Spark plug socket
• Noid light or multimeter
• Anti-seize compound

Parts Required:

• New spark plug
• New ignition coil (if faulty)
• New fuel injector (if necessary)

Estimated Repair Time: 2-4 hours

Safety Warnings:

• Disconnect the battery before working on electrical components.
• Allow the engine to cool before opening any components.