1 of mine went yesterday and the engine check light only flashed on a couple of times. A quick check with vagcom is what you need really but a misfire/judder/rough idle is usually a sure sign of a snafu'd coil.
it could be a lambda sensor too, got one gone at the minute too, car idles badly and no power then all of a sudden itll go again then down on power etc etc, getting replaced tomorrow.
I already had them replaced under warranty just under a year ago for the "new" version
Fact : New/modified versions of coil packs are just as unreliable as the old ones due to Seat being too tight to fork out for the manufacture of better ones.
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