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

Solution

1. Preparation

• Gather tools and necessary parts.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Ensure the engine is cool before proceeding.

2. Inspect and Replace the Spark Plug

• Tools Needed: Spark plug socket, torque wrench.
• Remove the ignition coil from cylinder 1 by unscrewing the bolts and gently pulling it out.
• Remove the spark plug using the spark plug socket.
• Inspect the spark plug for wear; replace if necessary.
• Install the new spark plug, ensuring it is at the correct torque (usually around 20 Nm).

3. Inspect and Replace the Ignition Coil

• If the spark plug is in good condition, inspect the ignition coil.
• If damaged, replace with a new ignition coil for cylinder 1.
• Reinstall the ignition coil by pushing it into place and securing it with bolts.

4. Check and Clean Fuel Injector (if necessary)

• If misfire persists, remove the fuel injector for cylinder 1.
• Tools Needed: Fuel line disconnect tool, injector puller.
• Clean the injector with a specialized cleaner or replace it if clogged or damaged.

5. Reconnect Battery and Clear Codes

• Reconnect the negative battery terminal.
• Use the OBD-II scanner to clear the P0301 code from the ECU.