how to fix P0302 misfire code in my BMW X5 F15 (2014-2019)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, dielectric grease.
• Remove the engine cover if applicable.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil by unscrewing the bolts and gently pulling it out.
• Use a spark plug socket to remove the spark plug from cylinder 2.
• Inspect the old spark plug for wear; replace it with a new one.
• Apply a small amount of dielectric grease to the new spark plug's threads.
• Reinstall the spark plug and tighten it to the manufacturer’s specified torque (typically around 15-20 Nm).
• Reinstall the ignition coil and reconnect the electrical connector.

3. Replace Ignition Coil (if necessary)

• If the ignition coil tested faulty, remove it as described above.
• Install a new ignition coil by reversing the removal steps.
• Ensure that the electrical connector clicks into place securely.

4. Test Fuel Injector (if necessary)

• Use a noid light to check if the fuel injector for cylinder 2 is receiving the proper signal.
• If the injector is faulty, remove it following similar steps to the ignition coil.
• Install a new fuel injector, ensuring all seals are in place to prevent leaks.

5. Reassemble and Final Checks

• Reconnect the battery.
• Start the engine and allow it to idle.
• Ensure that all connections are secure and there are no leaks.