my BMW 5 Series G30/G31 (2017-2024) has a check engine light and P0301 code

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Allow the engine to cool before starting.

2. Remove Ignition Components

1. Remove Engine Cover: Unscrew and lift off the engine cover (if applicable).
   • Tools Required: Socket set
2. Remove Ignition Coil: Disconnect the electrical connector and remove the bolt securing the ignition coil for cylinder 1.
   • Tools Required: Socket set
3. Remove Spark Plug: Use a spark plug socket to remove the spark plug from cylinder 1.
   • Tools Required: Spark plug socket
   • Safety Warning: Ensure the spark plug socket is deep enough to avoid damaging the spark plug during removal.

3. Inspect and Replace Components

1. Inspect Spark Plug: Check for excessive wear, carbon buildup, or damage. Replace if necessary.
   • Parts Required: New spark plug (if needed)
2. Test/Replace Ignition Coil: Using a multimeter, test the resistance of the ignition coil. Replace if it is outside manufacturer specifications.
   • Parts Required: New ignition coil (if needed)
3. Test/Replace Fuel Injector: Verify the operation of the fuel injector for cylinder 1. Replace if malfunctioning.
   • Parts Required: New fuel injector (if needed)

4. Reassembly

1. Install Spark Plug: Carefully thread the new spark plug into cylinder 1 and torque to the manufacturer's specifications.
   • Torque Specification: Typically around 16-23 lb-ft, but verify with manufacturer guidelines.
2. Reinstall Ignition Coil: Place the ignition coil back into position and secure it with the bolt. Reconnect the electrical connector.
3. Reattach Engine Cover: Replace the engine cover and secure it with screws.

5. Final Checks

1. Reconnect Battery: Reconnect the battery terminals.
2. Clear Codes: Use the OBD-II scanner to clear any stored codes.
3. Test Start the Engine: Start the engine and observe for smooth operation.