what causes my BMW 5 Series G30/G31 (2017-2024) engine to misfire with code P0301?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. 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. Unscrew the spark plug using a spark plug socket and ratchet.
  5. Install the new spark plug, ensuring it is torqued to the manufacturer's specification (typically around 22 ft-lbs for BMW).
  6. Reinstall the ignition coil and reconnect the connector.

3. Replace Ignition Coil (if necessary)

• Sub-steps:
  1. If the ignition coil shows signs of failure, remove it as described in the previous step.
  2. Install the new ignition coil by reversing the removal steps.
  3. Make sure all connections are secure.

4. Test Fuel Injector (if necessary)

• Sub-steps:
  1. Disconnect the fuel injector connector from cylinder 1.
  2. Use a multimeter to test the injector resistance (should be within the manufacturer's specifications).
  3. If faulty, remove the fuel rail to replace the injector and reinstall it.
  4. Reconnect the fuel injector connector.

5. Compression Test (if necessary)

• Sub-steps:
  1. Remove the spark plug from cylinder 1 again.
  2. Insert the compression tester into the spark plug hole.
  3. Crank the engine and observe the compression reading.
  4. If compression is low, further diagnosis is needed for internal engine issues.