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Old 08-22-2017, 02:41 PM   #1
equ's Avatar
Join Date: Aug 2005
Carmudgeonly Ride: 981S, 535i, macanurbo
Posts: 7,866
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.
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