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well, if you're having a shop to do it...replace all since they're in there
if another coil fails then you have to pay again
but if you DIY, its pretty easy so replace when needed
for spark plugs...repalce all
took me 30-40 minutes to replace spark plugs and 1 bad coil
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2006 325xi (Sold)
2014 M235I (Current)
2015 428xi Gran Coupe (STB)
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