how to fix the P0301 misfire code on my BMW 5 Series F10/F11 (2010-2017)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shock.
• Allow the engine to cool down before working on ignition components.

2. Inspect and Replace Spark Plug

• Sub-steps:
  1. Remove the engine cover if applicable.
  2. Disconnect the ignition coil connector from cylinder 1.
  3. Remove the ignition coil using a socket set.
  4. Extract the spark plug using a spark plug socket and ratchet.
  5. Inspect the spark plug for wear; replace with a new OEM spark plug if necessary (gap to specification).

Tools Required:

• Socket set
• Spark plug socket
• Torque wrench

3. Check and Replace Ignition Coil

• Sub-steps:
  1. If the ignition coil is faulty, install the new ignition coil onto cylinder 1.
  2. Reconnect the ignition coil connector.
  3. Ensure it is seated properly and secure.

4. Compression Test

• Sub-steps:
  1. Remove the spark plug from cylinder 1 again.
  2. Insert a compression tester into the spark plug hole.
  3. Crank the engine and read the compression value.
  4. If compression is low, further investigation is needed to check for valve issues or head gasket failure.

Tools Required:

• Compression tester

5. Fuel Injector Inspection

• Sub-steps:
  1. Disconnect the fuel injector connector from cylinder 1.
  2. Perform a resistance test on the injector with a multimeter to ensure it is within specifications.
  3. If faulty, replace the fuel injector.

Tools Required:

• Multimeter
• Injector removal tool (if necessary)

6. Reassemble

• After all necessary replacements, reassemble any removed components in reverse order.
• Reconnect the battery.