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      03-19-2012, 11:03 PM   #63
DaanBMW
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Drives: 2007 328i coupe
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Yeah, I'd also like to know WHY this should be done as a matter of maintenance and not just if any codes are triggered. What does it fix or improve ? How can you tell you might need it, short of any codes ? Rough idling is one symptom mentioned, anything else ?
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