Bad ignition coil. Replace all?
 

Have a 2013 35i with 135K.
Had coil for cylibder 4 go out. I have already replaced it.
Question is, should I replace all of them?

Sent from my SM-A366U using Tapatalk

I did on wife's n55. We replaced 2-3 that were acting up then did all the rest.


Sent from my iPhone using Tapatalk

It would be my philosophy to replace all of them at that mileage.

Same…Im lazy enough that I wouldn’t want to unwrap the top of the motor again in a month or two when the next one fails. Plugs too if they are that old!