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Old 10-03-2011, 07:18 PM   #1
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Join Date: Nov 2008
Location: Niagara
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Can bad spark plugs cause a check engine light

I have a 328is with a check engine light on I know that there are multiple reasons for an check engine light to come on, but would bad spark plugs cause this???

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Old 10-03-2011, 07:41 PM   #2
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Yes, it could, or a coil pack , but plugs are cheap,so do them regardless
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Old 10-03-2011, 08:39 PM   #3
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If they are bad enough, it could cause a mis-fire, the code will tell you the cylinder that mis-fired. But a mis-fire can be caused by several things.

If you have records of them being changed, just change em, they are cheap and will help your fuel mileage.
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Old 10-03-2011, 09:18 PM   #4
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for me it was bad o2 sensor.
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Old 10-03-2011, 09:29 PM   #5
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it could be alot of things, is the car running rough??
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