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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shocks.

2. Replace Ignition Coil

• Tools Required: Socket set, torque wrench, 10mm socket
• Instructions:
  1. Remove the engine cover (if applicable) by unscrewing any fasteners.
  2. Disconnect the electrical connector from the ignition coil for cylinder 2.
  3. Remove the bolt securing the ignition coil using the socket set.
  4. Pull the ignition coil out of the spark plug well.

3. Replace Spark Plug

• Tools Required: Spark plug socket, torque wrench
• Instructions:
  1. Using the spark plug socket, remove the spark plug from cylinder 2 by turning it counterclockwise.
  2. Inspect the spark plug for wear or deposits; replace it if necessary.
  3. Install the new spark plug by hand, then torque it to the manufacturer’s specifications (typically 22 lb-ft for BMW).

4. Check Fuel Injector

• Tools Required: Fuel injector puller (if necessary)
• Instructions:
  1. Disconnect the fuel injector connector for cylinder 2.
  2. Remove the fuel rail if needed to access the injector.
  3. Replace the fuel injector if it is clogged or damaged, ensuring to use new O-rings for a proper seal.

5. Reassemble and Test

• Reconnect all components, including the battery terminal.
• Reinstall the engine cover and any components removed during the process.
• Start the engine and allow it to run for a few minutes to ensure no misfires are present and the check engine light does not return.