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Old 12-10-2012, 08:50 PM   #1249
HiHoBrian
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Join Date: Jul 2011
Location: Connecticut
Posts: 1,114
My Ride: 05 M3
Thank god it was a joke. The rear sensors are mainly used for monitoring cat efficiency,but some information has shown a check and balance signal that is measured between pre and post for fine tuning of fuel trim for emissions purposes. It doesn't appear to be significant because may people run without them and use sims,lc1's,a eu2 tune,an aftermarket tune,or a simple resistor and cap mod that works.

sent from my ATARI sc1224
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