2010 S40 2.4i 82K miles
Daughter had her S40 into the Volvo dealer today to replace a previously diagnosed misfire and rough running caused by a weak #4 ignition coil. The dealer service advisor recommended replacing all five coils because of a probability they will all fail, with #4 leading the way. We opted to replace the #4 coil only, figuring each bad coil would show itself and be replaced in turn.
Btw, dealer also recommended replacement of front control arms ("bushings are weak"); and also replacement of a "collapsing" motor mount. We figured that collapsing motor mounts sort of go with the territory of owning a FWD Volvo and we'll monitor that. Not sure about the criticality of control arm bushings, however. Daughter senses no handling or steering problems and there is no abnormal wear of tires.
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