how to fix BMW 3 Series F30/F31 (2012-2019) that keeps throwing P0301 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the negative battery terminal to prevent electrical shorts.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge
• Remove the engine cover (if applicable).
• Use the socket set to remove the spark plug from cylinder 1.
• Inspect the old spark plug for wear; replace it if necessary.
• Check the gap on the new spark plug using a gap gauge and adjust as needed.
• Install the new spark plug, tightening to the manufacturer's specified torque (typically around 18-22 lb-ft).

3. Test or Replace Ignition Coil

• Tools Required: Socket set, multimeter (if testing)
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from cylinder 1 using the socket set.
• If testing, use a multimeter to check for resistance (consult service manual for specifications).
• If faulty, replace with a new ignition coil and reconnect the electrical connector.

4. Inspect and Clean Fuel Injector

• Tools Required: Fuel injector cleaner or suitable solvent
• Remove the fuel rail (if necessary) to access the fuel injector on cylinder 1.
• Inspect the injector for clogs or damage.
• Clean the injector using fuel injector cleaner.
• Reinstall the fuel injector and ensure all connections are secure.

5. Check for Vacuum Leaks

• Inspect all vacuum lines connected to the intake manifold.
• Replace any cracked or damaged hoses.
• Use a smoke machine or carburetor cleaner to check for leaks around the intake manifold gasket.