Replace one ignition coil or all six?
On the 535i a CEL that keeps coming back (and this time here to stay) seems to be due to a weakening coil (car still gets 27mpg) highway. Perhaps this coil is the reason for a shaky idle. I'm not sure.
Shop called me. If I replace one coil, it's $180 with labor. Should I replace all six for $580 (with labor) preemptively?
Plugs were done 10k miles ago.
|