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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 08-03-2012, 04:32 PM
manwer manwer is offline
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Location: Madison Wisconsin
 
Join Date: Sep 2010
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Mein Auto: 328ci
trouble light

This probably isn't a new thread but I'm not finding anything so I might be asking the wrong question. I have an intermittent Check Engine Light on my 328ci. It will illuminate, seemingly randomly, until I park the car for a few hours or a few days. Length of time doesn't seem to matter. When I start it up the light is gone and remains gone for several days or several start-drive-stop-park cycles. Then it can reappear. Anyone have any clues about this?
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Old 08-03-2012, 04:37 PM
cyberkaa cyberkaa is offline
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Location: Bay Area, CA
 
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Mein Auto: E46 332i, M3; E30 325i
The CEL is supposed to illuminate after 2 consecutive drive cycles when the fault is detected and extinguish after 3 consecutive cycles if the fault is not detected, IIRC. Some failures require more cycles.
It just means you have something on the verge of failing. You'll have to read the codes, which will be stored for 40 or 80 cycles even if the light is out and the fault is not detected.
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