my BMW X5 G05 (2019-2024) has a P0301 code, what's causing the misfire?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket
• Remove the engine cover if necessary.
• Disconnect the ignition coil connector and remove the ignition coil from cylinder 1.
• Remove the old spark plug using a spark plug socket.
• Inspect the spark plug for wear and replace it with a new one if necessary.
• Torque the new spark plug to the manufacturer’s specifications (typically around 25 Nm).
• Reinstall the ignition coil and reconnect the connector.

3. Check and Replace Ignition Coil (if needed)

• If the spark plug is in good condition but the misfire persists, replace the ignition coil.
• Remove the ignition coil from cylinder 1 as described in the previous step.
• Install a new ignition coil and ensure it is seated properly.
• Reconnect the ignition coil connector.

4. Inspect and Replace Fuel Injector (if needed)

• If the misfire continues, check the fuel injector for cylinder 1.
• Disconnect the fuel injector connector and remove the fuel rail if necessary.
• Remove the fuel injector from cylinder 1.
• Inspect the injector for clogs or damage; replace if necessary.
• Reinstall the fuel injector and ensure all connections are secure.

5. Final Assembly

• Reinstall any components removed during the process, such as the engine cover.
• Reconnect the battery.