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

Solution

1. Preparation

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

2. Inspect and Replace Spark Plug

• Sub-steps:
  • Remove the engine cover if necessary.
  • Locate the spark plug for cylinder 2 (refer to the owner's manual for specific cylinder layout).
  • Remove the spark plug wire or ignition coil connected to the spark plug.
  • Use a spark plug socket to remove the spark plug.
  • Inspect the old spark plug for carbon buildup or damage.
  • Install a new spark plug (use OEM specifications for gap and type).
• Tools Required: Spark plug socket, ratchet, torque wrench.
• Safety Warning: Ensure the engine is cool before attempting to remove spark plugs.

3. Replace Ignition Coil

• Sub-steps:
  • Remove the ignition coil for cylinder 2 by unscrewing any mounting bolts.
  • Disconnect the electrical connector from the ignition coil.
  • Install the new ignition coil (ensure it is seated properly).
  • Reconnect the electrical connector and secure the ignition coil with bolts.
• Tools Required: Socket set, torque wrench.

4. Check and Replace Fuel Injector

• Sub-steps:
  • If the injector is found to be faulty, relieve fuel pressure from the system.
  • Disconnect the fuel line and electrical connector from the injector.
  • Remove the fuel injector from the rail.
  • Install a new fuel injector and ensure it is secured properly.
  • Reconnect the fuel line and electrical connector.
• Tools Required: Fuel line removal tool, injector puller.
• Safety Warning: Work in a well-ventilated area and avoid sparks near fuel lines.

5. Reassemble and Test

• Reconnect the negative battery terminal.
• Start the engine and allow it to idle.
• Check for any new error codes and monitor engine performance.