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Old 08-22-2017, 03:57 PM   #10
John V
I only like old BMWs.
 
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Join Date: Apr 2005
Carmudgeonly Ride: 987S, Ram, MS3, 330Ci, CX-5, RX-8
Location: Glenwood, MD
Posts: 12,072
They should charge you a diagnostic fee. I wouldn't feel bad about paying for the diagnosis and doing the work myself.

I have no idea how they identified a coil getting "weak." If they scanned the car and saw a misfire on one cylinder, that would indicate (likely) that the specific coil had failed. If it were my car, I'd replace all the coils at that point.
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