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

Solution

1. Preparation

• Gather tools and parts needed.
• Disconnect the negative battery terminal to prevent electrical short circuits.

2. Inspect and Replace Spark Plugs

• Tools Required: Socket set, torque wrench, spark plug socket.
• Remove the engine cover if necessary.
• Disconnect the ignition coil connectors.
• Unscrew and remove the spark plugs using a spark plug socket.
• Inspect for wear or carbon build-up; replace if damaged.
• Install new spark plugs, ensuring they are gapped correctly according to specifications.
• Torque the spark plugs to the manufacturer's specifications (usually around 15 lb-ft).

3. Check and Replace Ignition Coils

• Tools Required: Socket set, torque wrench.
• Remove the ignition coils by unscrewing them from the engine.
• Inspect each coil for cracks or signs of failure.
• Replace any faulty coils with new units.
• Reinstall the ignition coils and torque them to specifications.

4. Inspect Vacuum Hoses

• Visually inspect all vacuum hoses for cracks, wear, or disconnections.
• Replace any damaged hoses with OEM or equivalent hoses.
• Ensure all connections are secure.

5. Test and Replace Fuel Injectors (if necessary)

• Tools Required: Fuel pressure gauge, injector cleaning kit (if cleaning is needed).
• Attach the fuel pressure gauge to the fuel rail and turn the ignition to the ‘ON’ position to check pressure.
• If fuel pressure is low, inspect the fuel pump and filter for clogs.
• If injectors are suspected of being clogged, use an injector cleaning kit to clean them or replace them if necessary.