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E46 M3 (2001-2006)

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Old 02-06-2013, 10:01 PM
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IEbimmerguy IEbimmerguy is offline
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Location: Cali
Join Date: Oct 2010
Posts: 129
Mein Auto: E38, e23, e3
2002 M3 with P0012 code

Hi all, I've been chasing down a sudden rough idle with my M3.
Upon first reading the codes, there were 17 of them. Ranging from misfires on all cylinders, to random misfires, to p0012, and p0014.
I thought it was the Vanos coil pack, so I replaced that with one from Beisan systems. I also cleaned out the solenoid valve block, changed out the intake CPS with a new BMW unit, and still have a rough idle and now code p0012 instantly.
I removed the valve cover and looked for the broken tabs, loose bolts, and everything looks fine.
Is this a Vanos failure? Anything else I'm missing that you could suggest?
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Old 02-17-2013, 02:18 PM
redlineteche30 redlineteche30 is offline
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Location: deerfield beach, florida
Join Date: Feb 2013
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Mein Auto: 1987 325e
I would do a smoke test to check for vacuum leaks. If you are using certain odb scanners they will register P0012 and associate it with fuel trim codes for unmetered air

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