how to fix P0300 code on my BMW 3 Series F30/F31 (2012-2019)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety.
• Allow the engine to cool down.

2. Replace Spark Plugs

• Remove the ignition coils by unscrewing the securing bolts and lifting them out.
• Remove the spark plugs using a spark plug socket.
• Inspect the old spark plugs; replace with new ones if they show signs of wear or fouling.
• Torque the new spark plugs to manufacturer specifications (typically 16-20 Nm or 12-15 lb-ft).
• Reinstall the ignition coils, ensuring they are seated properly.

3. Inspect and Replace Ignition Coils

• If any ignition coils showed signs of failure in diagnostics, remove the faulty coil.
• Install a new ignition coil, ensuring it is the correct part for the vehicle.
• Reconnect the electrical connector and secure it in place.

4. Clean or Replace Fuel Injectors

• If fuel injectors are found to be faulty, remove them using a fuel injector removal tool.
• Clean them using a specialized injector cleaner or replace them if cleaning does not resolve the issue.
• Reinstall the cleaned or new injectors, ensuring proper seating and connection.

5. Inspect Vacuum Lines and Intake System

• Visually inspect all vacuum lines for cracks or disconnections.
• Replace any damaged vacuum lines.
• Check the intake manifold for leaks or damage, resealing as necessary.