how to fix P0301 code on my BMW 3 Series F30/F31 (2012-2019)?

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench.
• Remove the ignition coil from cylinder 1.
• Unscrew the old spark plug using a spark plug socket.
• Inspect the spark plug for wear; replace if necessary.
• Install the new spark plug and torque it to the manufacturer’s specification (typically around 22 lb-ft).
• Reinstall the ignition coil.

3. Replace Ignition Coil (if necessary)

• If the ignition coil is damaged or faulty, replace it.
• Tools Required: Ratchet, socket set.
• Remove the bolts securing the ignition coil.
• Disconnect the electrical connector from the ignition coil.
• Install the new ignition coil and reconnect the electrical connector.
• Ensure it is seated properly and secure it with bolts.

4. Check Fuel Injector

• Tools Required: Fuel injector puller, basic hand tools.
• Disconnect the fuel injector connector.
• Remove the fuel rail if necessary to access the injector.
• Inspect or test the fuel injector for proper operation (using a multimeter if needed).
• Replace the injector if it is clogged or malfunctioning.

5. Perform Compression Test (if misfire persists)

• Tools Required: Compression tester.
• Remove the spark plug from cylinder 1.
• Insert the compression tester into the spark plug hole.
• Crank the engine and read the compression values.
• Compare with manufacturer specifications (typically 120-200 psi).
• If compression is low, further diagnosis of internal engine issues may be needed.