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

Solution

1. Preparation

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

2. Replace Spark Plug

• Remove the ignition coil from cylinder 2:

  1. Unplug the electrical connector from the ignition coil.
  2. Remove the mounting bolts using a socket set.
  3. Gently pull the ignition coil out of the spark plug hole.

• Replace the spark plug:

  1. Use a spark plug socket to carefully remove the old spark plug.
  2. Inspect the spark plug hole for debris and clean if necessary.
  3. Install the new spark plug, ensuring it is torqued to the manufacturer’s specification (typically around 25 Nm).
  4. Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil is faulty:
  1. Follow the steps from section 2 to remove the ignition coil from cylinder 2.
  2. Install the new ignition coil in reverse order, ensuring it is securely fastened.

4. Inspect and Clean Fuel Injector

• Remove the fuel injector for cylinder 2:

  1. Disconnect the electrical connector from the injector.
  2. Remove any retaining clips or bolts securing the injector.
  3. Carefully pull the injector out of the fuel rail.

• Clean or replace the injector:

  1. If cleaning, use a fuel injector cleaner and compressed air to clear any blockages.
  2. If replacing, install the new injector ensuring proper seating and secure the clips or bolts.

5. Reassemble and Reconnect Battery

• Reconnect the negative battery terminal.
• Start the engine and allow it to reach operating temperature.