how to troubleshoot P0301 code in BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Ensure the engine is cool before starting work.

2. Replace Spark Plug

• Tools Required: Socket set, torque wrench, dielectric grease
• Remove the engine cover if applicable.
• Disconnect the ignition coil connector for cylinder 1.
• Remove the ignition coil by unscrewing it and pulling it out.
• Unscrew the spark plug using a spark plug socket.
• Inspect the old spark plug for wear and replace it with a new one, ensuring it matches the specifications (typically around 0.024-0.028 inches gap).
• Apply a small amount of dielectric grease to the ignition coil's inner rubber boot before reinstallation.
• Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if necessary)

• Tools Required: Socket set
• If the ignition coil is damaged or malfunctioning, replace it with a new one.
• Remove the ignition coil as described above.
• Install the new ignition coil into the spark plug well and secure it with the retaining screw.
• Reconnect the ignition coil connector.

4. Check Fuel Injector

• Tools Required: Noid light or multimeter
• Remove the connector from the fuel injector for cylinder 1.
• Use a noid light to check for pulse signal while cranking the engine. If no pulse is detected, consider checking the fuel injector circuit or replacing the fuel injector.

5. Compression Test (if needed)

• Tools Required: Compression tester
• Remove the spark plug for cylinder 1.
• Insert the compression tester and crank the engine a few times.
• Compare the reading to the manufacturer’s specifications. If low, further investigation for internal engine problems is needed.