how to fix P0301 misfire code in BMW X5 F15 (2014-2019)

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before starting work.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1 by unscrewing the retaining bolts.
• Carefully pull the ignition coil out from the spark plug.
• Remove the spark plug using the spark plug socket and ratchet.
• Inspect the spark plug for wear; replace with a new spark plug if needed, ensuring it meets OEM specifications.
• Torque the new spark plug to the manufacturer’s specifications (typically around 23 ft-lbs).
• Reinstall the ignition coil and secure it with bolts.

3. Inspect and Replace Ignition Coil

• If the ignition coil is faulty, remove it using the same method as above.
• Replace it with a new coil that matches OEM specifications.
• Reinstall the new ignition coil and ensure all electrical connections are secure.

4. Check Fuel Injector

• Disconnect the electrical connector from the fuel injector on cylinder 1.
• Remove the fuel rail if necessary to access the fuel injector.
• Inspect the injector for clogs; clean or replace the injector if required.
• Reinstall the fuel rail and reconnect the fuel injector electrical connector.

5. Perform Compression Test

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine several times to take a reading.
• Compare the compression reading to the manufacturer’s specifications. If low, further investigation into engine internals may be necessary.