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

Solution

1. Preparation

• Gather tools and parts needed for the repair.
• Disconnect the negative battery terminal to ensure safety during the repair.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, spark plug socket, gap gauge.
• Remove the engine cover if installed.
• Locate cylinder 1 spark plug (consult the service manual for location).
• Using the spark plug socket, remove the spark plug.
• Inspect the spark plug for wear; replace if necessary.
• Set the gap on the new spark plug to manufacturer specifications (consult service manual).
• Install the new spark plug and torque to the manufacturer's specifications (typically around 22 Nm).

3. Inspect and Replace Ignition Coil

• Tools Required: Socket set.
• Remove the ignition coil for cylinder 1 by unscrewing the retaining bolts.
• Inspect the ignition coil for cracks or damage.
• If defective, replace with a new ignition coil.
• Reinstall the ignition coil and ensure it is seated properly.

4. Check and Clean Fuel Injector

• Tools Required: Fuel injector cleaner or replacement injector.
• If the fuel injector is suspected to be clogged, remove it from the fuel rail.
• Clean the injector using a specialized cleaning solution or replace it if necessary.
• Reinstall the injector and ensure proper connection.

5. Check for Vacuum Leaks

• Inspect all vacuum hoses connected to the intake manifold for cracks or disconnections.
• Replace any damaged hoses and ensure all connections are tight.