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Old 12-12-2012, 11:30 AM   #1250
lrz14
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Join Date: Dec 2011
Location: Pennsylvania
Posts: 45
My Ride: 2001 BMW 325ci
Yea i just been hearing a lot of different stuff like others saying that the post o2 sensors dont really and ignore them to loosing performance on the car not having them on so i have no idea what to believe. Any idea what the pre cat sensors do?
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