how to resolve P0301 misfire code in BMW X5 G05 (2019-2024)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative terminal of the battery.
• Allow the engine to cool if it has been running.

2. Inspect and Replace Ignition Components

• Tools Required: Socket set, torque wrench.
• Remove the engine cover to access the ignition coils.
• Disconnect the electrical connector from the ignition coil of cylinder 1.
• Remove the ignition coil using a socket and ratchet.
• Inspect the spark plug; if worn or fouled, remove it using a spark plug socket and replace it with a new one (use OEM specifications for type and gap).
• Install the new ignition coil and reconnect the electrical connector.
• Reinstall the engine cover and reconnect the battery.

3. Inspect and Replace Fuel Injector (if necessary)

• Tools Required: Fuel line disconnect tool, torque wrench.
• Follow the same preparation steps above.
• Remove the fuel rail if required to access the injector.
• Disconnect the fuel line and the electrical connector from the fuel injector of cylinder 1.
• Remove the injector and inspect it for clogs or damage; replace if necessary.
• Reinstall the new injector and reconnect all lines and connectors.
• Reattach the fuel rail and ensure it is securely fastened.

4. Perform Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove the ignition coil and spark plug again from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine several times to obtain a compression reading.
• Compare the reading to the manufacturer's specifications; if low, further investigation into internal engine issues may be needed.