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Old 02-12-2013, 06:45 AM
migow_76 migow_76 is offline
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Location: Atlanta
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Mein Auto: 330i
Ingnition coils 2006 330i sedan


I own a 330i with 85K miles on it. One day in November I started the car and it started running really rough and misfiring. I took it to the dealership and they said that an ignition coil needed to be replaced. Two months later, in January, same thing happened, and the dealership, of course, said it was another ignition coil. They said there are 6 of them, one for each cylinder and that they start failing. Is this normal around 85K miles? Seems like a problem you would encounter past 100K miles. The dealership also recommended (of course) that I have all the others replaced. Should I be worried about an underlying electrical problem causing this?
Also, the electric water pump and thermostat had to be replaced at 75K miles. Again, seems like a problem that would occur past 100K miles...
Thanks for any feedback!
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Old 02-12-2013, 08:12 AM
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cwinter cwinter is offline
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The ignition coils are common to fail. In fact, if one fails, the other ones are usually not far behind. On the NA engines, if you replace plugs and want to be aggressive with preventative maintenance, swap the coils out as well, since you'll swap plugs around 60-100k miles. BMW recommends 100k, some do it earlier to prevent seizing of the plugs. The N54/55 changes plugs more frequently and swapping coils each time as well might be a bit overzealous.

Otherwise, if one coil fails, it might just be a good idea to change all of them. They are not that hard to replace yourself, but the last 1 to 2 require removing the front strut brace, which might scare some away. I think a set of 6 coils can be had for about $150 when I last checked.
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Last edited by cwinter; 02-12-2013 at 08:33 AM.
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Old 02-12-2013, 08:28 AM
fb88 fb88 is offline
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Yes with all 6 at the same time when 1 fails. I have replaced 2 sets already one pre 50k the other at 100k when another one failed.
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