how to fix P0301 code in my BMW X3 F25 (2011-2018)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on the electrical systems.

2. Replace Spark Plug

• Remove the engine cover if applicable.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear or damage; replace if necessary.
• Apply a small amount of anti-seize compound to the threads of the new spark plug.
• Torque the new spark plug to the manufacturer’s specification (typically around 18 ft-lbs).
• Reinstall the engine cover.

3. Replace Ignition Coil

• Disconnect the electrical connector from the ignition coil for cylinder 1.
• Remove the bolt securing the ignition coil and pull it out.
• Install the new ignition coil, securing it with the bolt and reconnecting the electrical connector.

4. Inspect Fuel Injector

• Remove any necessary components to access the fuel injector for cylinder 1.
• Disconnect the electrical connector from the fuel injector.
• Remove the fuel injector using an appropriate tool, ensuring not to damage the O-rings.
• Inspect the injector for clogs or damage; replace if necessary.
• Reinstall the injector, ensuring a proper seal with new O-rings if required.

5. Perform Compression Test

• Remove the spark plug for cylinder 1 again.
• Insert a compression tester into the spark plug hole.
• Crank the engine and record the compression reading.
• If the compression is below the manufacturer's specifications, further engine diagnostics are required.