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

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Park the vehicle on a level surface and ensure it is in park or neutral.
• Disconnect the negative battery terminal to prevent electrical shock.

2. Inspect and Replace Spark Plug

• Tools Required: Spark plug socket, ratchet, torque wrench, dielectric grease.
• Remove the ignition coil cover (if equipped) using a socket set.
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from cylinder 1 by pulling it straight out.
• Use a spark plug socket to remove the spark plug from cylinder 1.
• Inspect the spark plug for wear or fouling and replace it if necessary.
• Apply a small amount of dielectric grease to the new spark plug's threads and install it hand-tight, followed by torqueing it to 15 lb-ft.
• Reinstall the ignition coil and reconnect the electrical connector.

3. Inspect and Replace Ignition Coil

• If the spark plug is not the issue, inspect the ignition coil.
• If faulty, remove the ignition coil from cylinder 1 as previously described.
• Install a new ignition coil and ensure it is seated properly.
• Reconnect the electrical connector.

4. Inspect and Test Fuel Injector

• Remove the fuel rail as needed to access the injector for cylinder 1.
• Use a fuel injector tester to check for proper operation.
• If the injector is faulty, replace it with a new one and ensure proper sealing.

5. Recheck Compression

• If misfire persists, perform a compression test on cylinder 1.
• If low compression is detected, further investigation for possible valve or piston issues may be required.