This will show you how to check a Siemens MSD80 ECU if you have a constant misfire on one or more cylinders. These ECUs can be found on petrol engines from the 120i to 335i models and more.
The driver chips to activate the coils can go bad, but luckily they can be repaired quite easy.
Replacement drivers are IRF644SPBF for the D2PAK surface mount type, and you can find these at RS Components, Farnell, Mouser etc.
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Background music is Flutter by Punchdeck
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