My daily driver, a 2008 BMW E90 318i developed an ignition issue. Engine Management Light on and a misfire.
This video shows how I diagnosed and fixed the issue using a Carista diagnostic tool, WD40 electrical contact cleaning spray and some electrical tape.
Features footage from @fixingassets I recommend you check out his channel.
Amazon affiliate links to products used; Carista diagnostic tool https://amzn.to/3S4KIZS WD-40 Electrical Contact Cleaning Spray https://amzn.to/3GtDsSE