how to fix P0301 cylinder 1 misfire in BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather necessary tools and parts to address the misfire.
• Disconnect the battery to ensure electrical safety during repairs.

2. Remove Ignition Components

• Tools Required: Socket set, ratchet, torque wrench
• Remove the engine cover if applicable (usually held by clips or bolts).
• Unplug the ignition coil connector for cylinder 1.
• Remove the ignition coil bolt and carefully pull out the ignition coil.

3. Inspect and Replace Spark Plug

• Remove the spark plug using a spark plug socket.
• Inspection: Check the spark plug for signs of wear, such as carbon buildup or electrode damage.
• If the spark plug is faulty, replace it with a new spark plug that meets OEM specifications.
• Torque the new spark plug to the manufacturer's recommended specification (usually around 23 Nm).

4. Test and Replace Ignition Coil (if necessary)

• If the ignition coil appears damaged or testing shows it is faulty, replace it with a new coil.
• Reinstallation: Place the new ignition coil into the cylinder 1 position and secure it with the bolt. Reconnect the electrical connector.

5. Check Fuel Injector (if necessary)

• If the issue persists, inspect the fuel injector for cylinder 1.
• Ensure proper electrical connection and clean or replace the injector if clogged or faulty.

6. Reassemble and Reconnect

• Reattach the engine cover and ensure all components are securely fastened.
• Reconnect the battery.