In this video I change the spark plugs and coils on my 2016 F30 328i. This process will be the same on the 428i and very similar on the 335i, 435i, 340i, 440i, 330i, and 430i. Changing your spark plugs and coils on your F30 with the N20 or N26 engine is one of the most basic DIYs you can do. Whether it is for preventive maintenance or to correct a misfire do not let this DIY intimidate you. Changing spark plugs and coils can be done on an F30 in approximately one hour with basic hand tools.
To complete the spark plug and coil job you will need a ratchet with the appropriate sockets.
14mm 12 point spark plug socket: https://amzn.to/3zW8bbl
DeWalt Metric Socket set: https://amzn.to/4caMlhT
Delphi Coils for N20/N26: https://amzn.to/3YdDUyE
NGK Spark Plugs for N20/N26: https://amzn.to/3zWGOhu