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      11-09-2012, 08:34 PM   #5
BimmerRob08
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Drives: 2008 M3, Space Gray
Join Date: Mar 2008
Location: KIKR (ABQ), NM


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Without a tune to shut off the rear O2 while running either no CAT's or even HFC's, it'll be coming on soon. The engine will detect a CEL for Increased Emissions. With a OBD CANBUSII reader you can delete the code but then it'll come back on. I went through that for months till I got a tune.

Good luck!