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Old 09-02-2012, 11:08 AM   #12
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Join Date: Aug 2006
Location: NJ
Posts: 23,589
My Ride: '99 328i 300K miles

From the diagram, I'd say #2, but that'd be an educated guess...again, post cat sensor, so that's the only one...and that's assuming that's your issue...which does seem likely.

I'd wait for confirmation from someone who isn't guessing, just to be safe!
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